Tesla · Source catalogue

A seven-page undergraduate course essay (submitted to Ray Russell, EE 155, 14 Oct 1998) summarising Tesla's life from three secondary books (Britannica 1976, Cheney's 'Man Out of Time', O'Neill's 'Prodigal Genius'). It covers childhood visualisation, the rotating magnetic field idea in Budapest, Edison and the $50,000 story, the Tesla Electric Company, Westinghouse and 60 Hz, the carbon-button lamp ('20 times as efficient' as Edison's bulb), the 1893 Chicago fair and the AC/DC war. It contains no primary Tesla papers and no 'free energy' content despite the filename.

Key claims

• The rotating magnetic field and polyphase system are Tesla's principal contribution to electromagnetic engineering.
• Tesla's carbon-button lamp was 20 times as efficient as the Edison bulb (repeated from Cheney; no test given).
• Westinghouse's frequency was changed from 133 Hz to Tesla's 60 Hz, which became the US standard.

Relevance: Background biography only; a student's retelling of Cheney and O'Neill. Useful as an example of how the popular narrative is passed on, not as evidence.

Mainstream conflict: None; standard popular biography (the $50,000 Edison story and the 20x lamp efficiency are repeated claims, not verified here).

A three-page modern essay that tries to reconstruct how Tesla's 1934-40 'teleforce' beam might have worked. It quotes the 11 July 1934 New York Times report ('10,000 planes 250 miles away') and Tesla's four listed 'inventions'. The author argues particle beams would scatter in air, lists three routes to wireless power, and proposes that Tesla focused a 'longitudinal wave' of electrostatic potential on the target with a Fresnel lens so that electrons would flow to the target as 'a directed bolt of lightning'. A worked figure of -15 V in the environment against -30 V at the target is given without derivation. OCR is partly garbled and the last page is a figure.

Key claims

• Tesla's death ray was a focused electron stream guided by a longitudinal electrostatic wave concentrated by a Fresnel lens.
• A particle beam of the kind usually imagined would be scattered and absorbed in air, so a 'hair-thin' beam would be a mechanical impossibility.
• Tesla probably considered three ways of wireless power (EM waves, DC particle accelerator, AC longitudinal-wave interference) and chose the third.

Relevance: A modern speculative reconstruction of the teleforce; it is the author's interpretation, not Tesla's description. Relevant to the death-ray / directed-energy claim.

Mainstream conflict: Speculative; 'longitudinal electrostatic waves' focused by a Fresnel lens have no support in standard electromagnetism, and the voltages are not derived.

A promotional/interpretive book arguing that Edwin V. Gray's 'cold electricity' circuits and Tesla's magnifying transmitter are the same device, running on 'radiant energy'. Chapter 1 retells Gray's story from tabloid articles; Chapter 2 reprints Vassilatos's 'Rosetta Stone' (Tesla's unidirectional impulse discharges as a shield-penetrating 'shocking field', impulse duration under 100 microseconds painless, 10,000 V per inch voltage magnification in a helix, 'aether fractionation'); Chapter 3 quotes Tesla's patents and 1900 and 1893 texts to 'verify' it; Chapter 4 redraws Gray's circuit (US 4,595,975, 4,661,747) as Tesla's and claims 99% of input is lost and 'a work output 100 times greater'. The author states he could not obtain Tesla's 1892 'Dissipation of Electricity' lecture, so the central narrative rests on Vassilatos alone. First-hand data: a lamp lit in the hands of the author and Tom Brown near Eric Dollard's coil (1986, no instrument readings), a photograph with '4 amperes' and '<2000 W' relayed from third parties, and the author's statement that dozens of attempts to combine voltage and current from separate sources 'don't work'. Appendices reproduce Gray's patents and Tesla's patents 593,138, 685,958 and 787,412, and two Lindemann articles on thermodynamics and 'ethericity' with a Steiner-style four-ether model. QE deep read: the 1973 Gray demonstrations are known only from press reports by Tom Valentine (National Tattler, 1 and 8 July 1973; Lindemann's friend and source), Probe the Unknown and NewsReal: a 6 V battery charging capacitors to 3,000 V and throwing a 1.25 lb magnet two feet 'cold' (Richard Hackenberger, EVGray vice-president: 'only 1% of the energy was used - 99% went back into the battery'); six 15 W bulbs, a television and two radios run from a motorcycle battery (C. V. Wood Jr., president of McCulloch Oil, 'the most amazing thing I've ever seen'); a 40 W bulb lit under water with no shock to the reporter. No input or output energy was measured or recorded. Lindemann's own build of Gray's 1975 patent US 3,890,548 (received 1978): 'if you try to build this motor according to the principles outlined in this patent, it doesn't perform anything like what was described in the Valentine articles. In fact, it doesn't produce a cold form of electricity at all ... the amount of energy that could be recycled from this arrangement is negligible'; no data are given. The book's legal record (the author's summary of press accounts, the Gray side): a Los Angeles District Attorney raid on 22 July 1974, a 'grand theft' charge that was dropped, a guilty plea by March 1976 to two minor SEC violations (confirmed as 'a minor Securities and Exchange violation' by the 1977 NewsReal text), prototypes not returned; Gray died in April 1989 in Sparks, Nevada 'under mysterious circumstances'; no case numbers or DA/SEC statements are given. Lindemann's two Journal of Borderland Sciences articles: 1994 'Thermodynamics & Free Energy' (the First Law is 'essentially incorrect'; free energy is in the 'Etheric Energy Field'; no measurements beyond a hypothetical 100,000:1 weather-engineering gain) and 1995 'Tesla's Self-Acting Engine' (based on Tesla's 1900 Century article; a two-phase heat-pump/steam-turbine concept; asserts working machines by Doczekal, Schaeffer and Serogodski, and Wiseman with no power-in/power-out figures).

Key claims

• Abrupt unidirectional high-voltage DC discharge across a magnetically quenched spark gap produces a longitudinal 'electro-radiant' event that is a different kind of energy from ordinary electricity.
• Impulses shorter than 100 microseconds pass through matter and are painless; shorter than 1 microsecond they produce heat; shorter still they light vacuum globes cold.
• Tesla's magnifying transmitter and Gray's conversion-tube circuit are, for all intents and purposes, the same circuit.
• Gray's circuit gives about 100 times more work output than the energy lost in the spark gap.
• The laws of thermodynamics and Maxwell's equations do not apply to 'etheric' technologies.
• Edwin Gray's 1973 demonstrations (a magnet thrown by a 6 V battery with 99 per cent of the energy returned; bulbs, a television and radios run from a small battery) were witnessed by Valentine, Hackenberger and C. V. Wood Jr.; no energy measurement was made (press reports; Lindemann was not present).
• Lindemann's own build of Gray's 1975 patent did not reproduce the described performance and recovered 'only a negligible amount of energy' (no data given); he concludes the patent does not reveal the technique.
• Gray was raided by the Los Angeles DA in July 1974, charged with grand theft (dropped) and pleaded guilty to two minor SEC violations by March 1976 (the book's account; no court records cited).
• The reprinted Tesla patent US 787,412 (pp.137-139) describes accumulating many synchronised weak impulses in a condenser to drive an insensitive receiver; it claims no energy gain, says nothing about the laws of thermodynamics and gives no measured received energy.
• Lindemann (1994) holds that an 'Etheric Energy Field' moves energy from low to high concentration without work, so the second law is broken, and that 'over-unity' is an oxymoron; the figures he quotes (a '100,000 to 1' weather-engineering gain that 'has never been done', Tewari's 'twice as much hydrogen' from a rotating-magnet generator, unnamed patents heating water with 'less than half' the mechanical work) come with no instrument, protocol or control (pp.143-146).
• Lindemann (1995) proposes a cycle with a compressor, an ambient heat exchanger, a throttle and a turbine 'of a peculiar kind' and no condenser, whose turbine output is claimed to exceed the compressor input; no energy balance or measured efficiency is given, and the existence proofs named (Doczekal, Austrian patent 155744, 1939; Schaeffer and Serogodski, DE 42 44 016 A1; Wiseman's HEAT books, sold through Eagle Research, whose address and price he prints) have no test data (pp.149-152).
• The back cover (seller's copy, interested party) claims Tesla found the 'cold electricity' effect in 1889 and carries blurbs from T. J. Constable, B. Desborough ('well over 1000 amps', no set-up) and K. Rauen (Infinite Energy, January 2001) (p.156).

Relevance: The main source in the folder for the 'radiant energy / cold electricity' interpretation of Tesla and its link to Gray, Moray and Baumann (Testatika). It is an interpretation layered on Vassilatos; the Tesla quotations it uses describe oscillating, not unidirectional, discharges.

Mainstream conflict: Claims energy gain from a spark-gap impulse, shield penetration, and a non-electromagnetic 'aether fraction'; conflicts with energy conservation and Maxwell's equations. The only numbers (4 A, <2000 W, 400 kV guess, 2 uF/4000 V labels) have no instrument records.

Tesla's patent for winding a flat coil from two parallel insulated strands joined in series, so that adjacent turns differ by about half the terminal voltage. His stated object is to replace separate condensers by building into the coil the capacitance that neutralises its self-induction at a given frequency. His worked example: a 1000-turn coil with 100 V across it has 0.1 V between turns; the two-strand coil has 50 V between turns, and since stored energy goes as voltage squared the energy stored is (50/0.1)^2 = 250,000 times as great (the arithmetic checks). He concedes that side-by-side series strands are old and claims only the purpose. There are two functional claims, no frequency, no inductance or capacitance values, no measurement, and no mention of voltage gain, resonant rise or the word 'bifilar'.

Key claims

• A coil wound so that adjacent turns have a large potential difference has enough distributed capacitance to neutralise its own self-induction at a given frequency.
• In a two-strand series coil of 1000 turns at 100 V the stored energy is 250,000 times that of an ordinary coil (50 V between turns against 0.1 V).
• Capacitance obtained this way is evenly distributed along the coil and is increasingly advantageous as size, voltage or frequency rise.

Relevance: The patent that Nichelson reads as Tesla's non-mechanical 'fuelless' energy extractor and the origin of the bifilar voltage-gain papers. The patent itself says nothing about gain.

Mainstream conflict: None in the patent. Distributed capacitance of a bifilar winding is standard; the gain and fuelless readings are later authors' additions.

A 499-page scan (498 pages OCR) of Tesla's US patents in date order. Early part: arc lamps and dynamo regulators (1886), the polyphase and induction motors (381,968-382,282; 1888), commutators, thermomagnetic motor and pyromagnetic generator (1889-90), a unipolar dynamo (406,968), a high-frequency alternator (447,921), and the 1891 lighting patents (454,622 'System of Electric Lighting', 455,069). Middle: power transmission (487,796; 511,559-511,916), 512,340 'Coil for Electro-Magnets', 514,167-514,173, the reciprocating engine and oscillator (514,169, 517,900), high-frequency apparatus (568,176-568,180, 577,670, 583,953), 593,138 'Electrical Transformer', circuit controllers (609,245-613,735) and telautomaton 613,809. Wireless power: 645,576 (air-conduction method, 'model plant' 0.04 uF, 50 kV, 5000 breaks/s, 244 cm loop, 230-250 kHz), 649,621, 685,012 (liquid-air cooled resonators), 685,953-685,956 (stored-energy receivers), 685,957/685,958 (radiant energy), 723,188, 725,605, 787,412 (stationary waves in the earth), 1,119,732. Later: fluid propulsion and turbine (1,061,142; 1,061,206), speed indicator and meters (Waltham Watch Co.), lightning protector 1,266,175, valvular conduit 1,329,559, aerial transportation 1,655,113-4. Tesla was the applicant for each, so all statements are his own characterisation; a grant is not a test. QE deep read of pp.404-448: US 787,412 (filed 16 May 1900, granted 18 Apr 1905) says the planet behaves like 'a perfectly smooth or polished conductor of inappreciable resistance ... transmitting slow electrical oscillations without sensible distortion and attenuation', gives 'many tens of thousands of horse-power' of circulating activity in the resonator (not power delivered), requires a frequency 'smaller than twenty thousand per second', lowest 'six per second', a wave train lasting 'not less than ... 0.08484 of a second' at a mean surface speed of 471,240 km/s (exactly pi/2 times 300,000 km/s), and reports lightning-wave lengths of 25-70 km; these quotations were checked verbatim on the page image of PDF p.425. No patent in this range gives a measured transmission loss or efficiency; 1,119,732 gives 'tens and even hundreds of thousands of horse-power' in a resonating circuit and is about preventing leakage. 685,957 and 685,958 (radiant energy) describe charging a condenser from rays/particles with no rate or voltage. Source defect: PDF p.415 is an exact duplicate of p.414, so US 723,188 is present only as its drawing and first specification page (its claims are missing); 723,188 and 725,605 say Tesla operated 'more than one hundred receivers' selectively and that influence on receivers extends 'many hundreds of miles'.

Key claims

• Atmospheric air, made conducting at millions of volts and moderate rarefaction, can carry industrial amounts of electrical energy to any terrestrial distance (US 645,576).
• The transmitting and receiving coils should each be a quarter wavelength long with the high-potential end at an elevated terminal, giving resonance (US 645,576, 649,621).
• The transmission is 'true conduction', not electrical radiation (US 649,621).
• Cooling a freely vibrating circuit with liquid air magnifies the resonant rise 'very many times' (US 685,012).
• Stationary electrical waves can be set up in the earth and used for power, signalling and navigation (US 787,412).
• A disk-runner turbine and pump using fluid adhesion and viscosity need no vanes or blades (US 1,061,142; 1,061,206).

Relevance: The primary patent record for almost every Tesla claim in this folder (AC systems, resonance, wireless power, radiant energy, disk turbine, bifilar coil). The wireless-power patents give the only numerical 'model plant' values.

Mainstream conflict: Wireless-power patents assert air conduction at 20-50 million volts and energy transmission to any distance with low loss, supported by no data in the patents; the one experiment described used a 50-foot evacuated tube at 120-150 mm Hg, not free atmosphere. Polyphase motor patents are mainstream and foundational.

A redacted FOIA scan of the Bureau's Tesla file. 1940: a citizen's letter and the NYT 'teleforce' clipping get a form reply. January 1943: teletypes record informants Spanel and Bloyce Fitzgerald claiming Tesla's formulae, a working 'death ray' model and 80 trunks were at risk; the FBI's own inquiry found that Kosanovich, George Clark and Kenneth Swezey opened the safe (the file gives 7 and 8 January) with a locksmith or a Shaw-Walker representative, took only a testimonial book and three photographs, and that on 9 January the Alien Property Custodian's Gorsuch and a Fitzgerald sealed about two truckloads at Manhattan Storage; a Governor Clinton Hotel box was held for a $400 debt. Washington (Ladd, Tamm) told New York to approach the State's Attorney and Surrogate Court, then a handwritten note says the Custodian is handling it. A 1945 report places Pvt Bloyce Fitzgerald at Wright Field; a 1950 review found one visit by 'Federal authorities' (microfilming/photographing). From 1948 to 1981 every reply says the Office of Alien Property, not the FBI, took the papers; correspondents cite O'Neill's claim that FBI operatives opened the safe, and the FBI says the claim is untrue. 1957: NY memo on a 'Tesla Set' flying-saucer newsletter. 1981: DoD (Lt Col MacLaren) asks for Tesla papers; the FBI replies that OAP, OSRD (MIT), ONI and NRL examined them, that Trump found nothing of value, and that the papers were released to Sava Kosanovich. Deep read of pp.70-133: a 25 July 1957 New York memo (an informant's complaint about a 'Tesla Set' newsletter, with the FBI's summary of the 1940 'teleforce' press and its phrase 'wall of force'); a 6 December 1960 memo (the earlier 'Air Force 1959' dating is wrong) recording a caller 'making a research study for U. S. Air Force on subject of geophysics' who cited O'Neill and was told the statement was untrue and referred to the Office of Alien Property; a 1970 letter passing on a second-hand account of 'Mr. Tesla's notes blowing down the street when the junk men were dismantling his equipment' (the plant is not named); the 1976 Design News article on Project Tesla (Golka and Bass, Wendover, 20 MV discharges, 'based upon the unpublished notes of Nikola Tesla') sent in with a letter whose writer is redacted, with an O'Neill manuscript excerpt on fireballs; and the 1981 Defense Department request: a memo of 9 Feb 1981 from the Office of the Under Secretary of Defense (Research and Engineering), Lt Col Allan J. MacLaren, saying 'certain of Tesla's papers may contain basic principles which would be of considerable value to certain ongoing research within the DoD'. The FBI's replies of 10 and 20 March 1981 say the papers were never in FBI custody, list the 26-27 January 1943 examiners, and relate a 17 October 1945 memo that Tesla's effects were then still sealed in 'some 75 packing boxes and trunks' at Manhattan Storage and that on 26 October 1945 'a young scientist who had been Tesla's protege' and two men 'from a research development unit at Wright Field' asked for access and were referred to the Alien Property Custodian; the FBI file does not say whether they examined the effects, and a 1950s recollection is that 'Federal authorities' photographed or microfilmed papers in January 1943. The FBI's own 1981 statements disagree on whether the papers were released to Kosanovic in February 1943 or still stored in 1945. These are the FBI's characterisations; the FBI has a stake in the O'Neill 'FBI took the papers' question.

Key claims

• The Office of Alien Property Custodian sealed Tesla's effects on 9 January 1943 and the FBI did not take custody (FBI position, 1948-1981).
• The January 1943 safe opening yielded only a testimonial book and three photographs, according to the FBI's own inquiry and hotel managers.
• Federal examiners (Navy-uniformed per a warehouse supervisor) photographed or microfilmed some papers in January 1943.
• The FBI file does not say what became of the Governor Clinton Hotel box or whether the OAP later released the estate to Kosanovich (a 1981 FBI letter says it did).
• In 1981 the Office of the Under Secretary of Defense asked the FBI for Tesla's papers because they 'may contain basic principles which would be of considerable value to certain ongoing research within the DoD' (MacLaren memo, 9 Feb 1981).
• On 26 October 1945 a former Tesla protege and two men from a Wright Field research unit asked the FBI for access to Tesla's effects, then sealed at Manhattan Storage in some 75 boxes and trunks; the FBI referred them to the Alien Property Custodian and does not record whether they examined them.
• On 6 December 1960 a researcher for the U.S. Air Force in geophysics asked the FBI for Tesla's scientific works after reading O'Neill's statement that the FBI took the papers.

Relevance: The main record of what happened to Tesla's papers after 1943. The FBI is a party with a stake: it is accused of seizing the papers, and its replies are its characterisation. The file is internally inconsistent on the date of death (7 or 8 January) and on the OAP role.

Mainstream conflict: None; historical record. It contradicts O'Neill's 1944 statement that FBI operatives opened the safe and took the papers, and it shows the FBI played a larger role in early inquiries than its later form letters say.

Continues the 1983 SECRET airtel from the SAC Cincinnati to the FBI Director: two Wright-Patterson AFB (Foreign Technology Division) staff, one named only as 'Butler', whose area is Soviet beam weapons, want FBI Tesla files because the Soviets 'allegedly' had access to some of Tesla's papers; Butler could find no Tesla papers in WPAFB classified or unclassified libraries, only a report that the Custodian shipped some to a WPAFB laboratory ('Equipment Lab'). No evidence is given for the Soviet claim. The remainder is the enclosed Cheney pages (including her account of an August-September 1945 request from Wright Field, via Pvt Bloyce Fitzgerald, for photostats of the Trump-annotated exhibits, which were forwarded and 'never returned') and 1940s FBI/OAP pages: Hoover's 11 Jan 1943 memo, Abe Spanel's 1943 statement, a 1945 informant report on Fitzgerald at Wright Field, and John G. Trump's January 1943 conclusion that Tesla's papers contained nothing 'of significant value' or hazardous in unfriendly hands, with the full abstracts of Exhibits A-Q (QE deep read pp.43-48, dated 30 January 1943, Trump's abstracts of a 'typical' sample of Tesla's 1925-1942 writings, in random order). Trump's exhibits in full: F 'New Art of Projecting Concentrated Non-Dispersive Energy through Natural Media' (an electrostatic generator accelerating charged particles, 'presumably electrons', through an open-ended vacuum tube into air; Trump: 'incapable of the transmission of large amounts of power in non-dispersed beams over long distances' and the disclosure 'would not enable the construction of workable combinations'); H letters of 28 Aug 1936, 26 Oct 1937, 15 Dec 1937 and 5 Apr 1938 to British Government representatives offering for a fee a particle beam as a 'death ray' for protection against air attack, with a British reply of 7 Jan 1938, 'a polite expression of disinterest'; J 'A Method of Producing Powerful Radiations', in Tesla's hand, whose only description is a high-speed fluid jet creating 'a vacuous space around a terminal of a circuit'; Q a signed agreement of 20 April 1935 between Tesla and the Amtorg Trading Corporation (Soviet trading body) to supply plans for 'high voltages up to fifty million volts', 'very small particles in a tube open to air', projected 'to distances of a hundred miles or more' at 'not less than 350 miles per second', for a $25,000 fee, which Trump judged to be the Exhibit F method and 'subsequently proved unworkable' (Trump's inference). Trump has an institutional stake (OSRD evaluator for the war effort). A 'List of persons associated with Nikola Tesla' (pp.49-60, unsigned, undated) names people said to hold Tesla material, including O'Neill's report that Tesla told him the British approached him through Baldwin and Chamberlain and a range of 200-250 miles.

Key claims

• The Soviet Union allegedly had access to some of Tesla's papers that influenced its early directed-energy research (airtel p.2; no evidence cited).
• No Tesla papers were found in the WPAFB classified or unclassified libraries in 1983; some may have been shipped from the Alien Property Custodian to a WPAFB laboratory (Cheney documents the 1945 photostat shipment).
• Dr John G. Trump (NDRC/OSRD) found in January 1943 that Tesla's papers had no scientific notes or devices of significant value or hazard.
• Written descriptions of the 'teleforce' particle beam existed in 1943 (Trump's Exhibits F, H, J and Q: letters to the British Government 1936-38 and a paid 1935 disclosure to Amtorg); Trump judged them unworkable; no apparatus or test is on record and the full texts are not in the folder.
• On 20 April 1935 Tesla signed an agreement with the Amtorg Trading Corporation for $25,000 to supply plans for a 50-million-volt particle projector (range 100 miles or more, particle speed at least 350 miles per second), the best-documented Soviet link in the file.

Relevance: Documents the 'seized papers' and 'Soviet beam weapon' thread and gives the only contemporaneous technical appraisal (Trump) of what the papers contained. The Wright-Patterson shipment is a lead on where copies may be.

Mainstream conflict: None; historical/intelligence record. The Soviet claim is a requester's characterisation (an interested party seeking file access), unsupported in the airtel.

A clean-text web copy of Tesla's Feb 1919 article, with editorial prefaces, so the figure captions and Fig. 7 reflection argument can be read without OCR errors. Same content as the Feb 1919 scan: (I) the moon does not rotate on its axis; (II) Franklin's pointed lightning rod is a design fallacy because a point's discharging power falls with the size of the charged body; (III) wireless works by true conduction through the earth, not Hertz waves, with the earth/atmosphere to scale, a rubber-bag-of-water analogy, an 'efficiency (1/4)^30' reflection argument giving a '115 billionth of a watt', and a ground-current speed that varies as the cosecant of the angle.

Key claims

• The moon's axial rotation is an illusion; it rotates only about an axis through the earth's centre.
• A grounded pointed rod could not drain a thundercloud in many years; a large-radius terminal is better.
• Wireless energy travels as a ground current at speed c/sin(theta), recoverable in tuned receivers, while Hertz-wave energy is unrecoverable.

Relevance: Convenient clean copy of a central Tesla statement on conduction versus radiation. Same article as the scan and as 'Tesla Said' pp.199-206.

Mainstream conflict: Moon-rotation claim contradicts mechanics (the moon's spin equals its orbital period and has non-zero rotational energy). The (1/4)^30 arithmetic does not give 115 billionth of a watt (it gives about 0.9 picowatt from 1 MW). Ground-wave propagation is mainstream; the cosecant speed law and full recoverability are not.

Tesla's article on 'three errors': the moon's axial rotation (washer demonstrations; the energy-of-motion argument; origin theories of satellites; conclusions that a body thrown off a larger one cannot spin), Franklin's pointed rod (sphere-and-pin potential argument: the driving difference falls by (r+h)/(nr+h) for a sphere n times larger; Tesla's own non-pointed protector 'never struck'), and wireless. In Part III he recounts Helmholtz (1893) and Kelvin (summer 1897: 'an illusion and a snare', then converted when told it was conduction not Hertz waves), gives the rubber-bag analogy (a pulse period over 1 h 48 min moves the whole bag), a reflection argument ((1/4)^30 of 1000 kW stated as 115 billionth of a watt; recomputed it is about 0.9 picowatt), the earth-and-air layer drawn to scale, and the ground-current speed law v = c/sin(theta). The word 'ether' appears only in editors' captions; Tesla's text contrasts Hertz radiation with true conduction. No measured receiver data are given.

Key claims

• The moon does not rotate on its axis; 'it rotates about an axis through the earth's centre'.
• A pointed lightning rod cannot appreciably discharge a cloud; a large rounded terminal is safer.
• Hertz waves cannot carry usable energy round the earth; the earth-conduction current is recoverable 'in its entirety'.
• Ground-current speed varies as the cosecant of the angle from the transmitter's axis, infinite at origin and antipole and c at a quadrant.
• Energy for an aeroplane, boat or house lighting can be recovered at any point of the globe.

Relevance: Tesla's late (1919) summary of his case for earth-conduction wireless and of his criticisms of orthodox physics. Primary text.

Mainstream conflict: Moon spin and Franklin-rod claims conflict with mechanics and with lightning-protection experience; the 115-billionth figure is arithmetically inconsistent with its own premises; earth conduction as a power link is untested and conflicts with the standard wave picture.

Nichelson argues that the 1900 Century article's 'self-acting' engine, Tesla's 1902 letter to R. U. Johnson (prompted by a Herald clipping about Clemente Figueras) and Tesla's 1931 and 1933 newspaper statements about 'harnessing cosmic rays' refer to a real fuelless generator, identified at two stages: the 1889 unipolar disc dynamo (spiral cuts so the rim current reinforces the magnet) and the 1893 bifilar flat coil (US 512,340), modelled as a high-voltage electrostatic oscillator that 'sinks' charge from the earth-ionosphere field. His own words are 'speculation' repeatedly. He cites Elsasser (a self-excited Faraday disc needs a conductor 1000 times better than copper, high speed or large size), a Linde analogy, an earth-capacitor estimate (C = 0.25 F, 4.5 MWh; the text's '1.6 x 10^11 J' should be 1.6 x 10^10 J) and 'preliminary measurements' by M. King and Nichelson at Eyring Inc. on two 3-inch, 43-turn coils (bifilar shows higher voltage gain; Fig. 6 values not in the text). No operating device, witness or output measurement is cited, and the paper says commercialisation was blocked by industry.

Key claims

• Tesla claimed (1902, 1931, 1933) to have built a generator needing no fuel, drawing on the sun's or cosmic energy.
• The unipolar dynamo and the bifilar coil of US 512,340 are two stages of that device.
• A bifilar coil operated near resonance behaves as a self-oscillating electrostatic system that extracts energy from the earth's field.
• A bifilar coil shows more voltage gain than a single-wound coil of the same size (Eyring measurements, values not given).

Relevance: The origin of the 'fuelless generator' reading of Tesla. Advocate's paper: it reports Tesla's statements and designs, and the two-stage identification is Nichelson's inference.

Mainstream conflict: A device producing more energy than it consumes violates energy conservation and the second law unless a real external gradient is tapped; the unipolar disc argument conflicts with Elsasser's criteria; no output measurement is given.

A hobbyist booklet proposing a 'third generation' Tesla coil: a closely coupled, multilayer, oil-immersed coil (after Tesla's 1892 London coil) driven one-for-one by a solid-state pulse generator (555/4584 chips, TC4429 driver, IRF640 FET) with pulse width a quarter wavelength. Claims: loose coupling is needed only to survive spark-gap vagaries; a 12 V battery drove the closely coupled oil coil to over 2000 V ('magnification of 166'); the oil coil gives 'an empowerment' beyond insulation; one four-foot fluorescent tube lit at 450 mA-1 A at 12 V (5.4-12 W), 'half the light for a third of the power' of a conventional tube by eye; three tubes in series at 24 V and 1 A. All performance statements are input-side (battery current); there is no light-output, efficiency, coil Q or coupling-coefficient measurement, and the comparison is with an old magnetic-ballast tube. The author sells the booklet and kits of information.

Key claims

• A closely coupled multilayer oil-immersed Tesla coil with a one-for-one solid-state drive is more efficient than the loosely coupled single-layer coil.
• A 12 V battery drives such a coil to more than 2000 V at its terminal.
• A fluorescent tube can be lit from this coil at current draws and light levels superior to conventional ballasts (judged by eye and a photoresistor).
• Oil provides an effect beyond insulation ('oil's dielectric dynamics').

Relevance: Practical amateur work claiming that Tesla-coil lighting is more efficient; testable by the reader's own ammeter and a light meter. Voltage 'magnification' is a ratio, not a power gain.

Mainstream conflict: Voltage step-up is not energy gain; efficiency claims lack photometric data, and modern electronic ballasts also run at tens of kHz. Close coupling raises well-understood design trade-offs.

A compiler's anthology on the Tesla disc turbine and pump. Contains 1911-12 press (Electrical Review, NY Times, Scientific American, ENR, Popular Mechanics, Technical World), Tesla's own accounts (10 hp per pound; 200 hp at 9000 rpm with 125 psi and free exhaust on the 18-inch Waterside machine; 38 lb steam per hp-hour; 110 hp on a 9.75-inch rotor; projected 8-12 lb per hp-hour if compounded), a 1931 sea/earth heat power plant, patents 1,061,142, 1,061,206, speed indicator and valvular conduit, and British patents. The deep-read pages give Lowenstein's sworn July 1911 report with two test tables (18,000 rpm: 102.8 bhp, 53.4 lb steam per bhp-hour recorded by 'Prof. C. D. Richards'; and 77 hp at 35 lb) and Hans Dahlstrand's Allis-Chalmers account of a 60-inch, 500 kW unit with about 38% mechanical efficiency, disk distortion and need for gearing. Recomputed against the ideal single-stage expansion, every measured figure lies at roughly 25-52% of ideal (IAPWS-IF97 recomputation, arbiter QE revision E), against the 80-90% Tesla stated to a journalist. The unsigned 'Tesla Pumps Generating Sales in the Multi-Millions' article is promotional and gives no sales or test data. Note for later steps: Lowenstein's report names the test observer 'Professor C.D. Richards' while elsewhere Hayes prints 'C.B. Richards, Professor Emeritus of Mechanics, Yale' (QE spot check); the discrepancy is unresolved. Lowenstein's first table (102.8 bhp at 53.4 lb of steam per bhp-hour, 100 lb gauge, 15 in. vacuum, 18,000 rpm) corresponds to about 25 per cent of ideal expansion (QE's memory-based 27 per cent, superseded by the IAPWS-IF97 recomputation in arbiter QE revision E), which sets the low end of the 25-52 per cent band; brake horsepower includes gear losses.

Key claims

• A disk (boundary-layer) turbine gives about 10 horsepower per pound of weight.
• The 18-inch single-stage Waterside turbine developed 200 hp at 9000 rpm and consumed 38 lb of saturated steam per hp-hour.
• Compounded with a condenser the turbine would use 8-12 lb of steam per hp-hour and reach 80-90% efficiency.
• The Allis-Chalmers 500 kW test (c.1912-13) reached about 38% mechanical efficiency and the disks distorted.
• Tesla's bladeless pumps are sold commercially and the patents are now public domain.

Relevance: The main body of evidence for the disk turbine: Tesla's claims, the one sworn associate's test report, and the manufacturer's engineer's report. Mixed independence: Dahlstrand worked for the firm that ended collaboration; Lowenstein was Tesla's former employee.

Mainstream conflict: The disk-drag principle is real and used in pumps and viscous devices, but measured efficiencies were far below Tesla's statements, and the Maule/Stockbridge 'tug-of-war' torque spring readings rest on Tesla's calibration. Compiler's dating of the Stockbridge article as 1920 is wrong (internal evidence puts it at 1910-11).

A one-page report of experiments in which one pole of a Ruhmkorff coil was earthed (gas pipe) and the other connected to a large insulated conductor, which made the spark thicker and shorter and let sparks be drawn from metal objects up to 30 feet from the coil, in other rooms and from a steam engine. Houston concluded that a larger insulated conductor should increase the quantity of the spark and proposed one of several hundred square feet. It is a pre-Tesla observation of an earth-and-elevated-capacity connection of the kind Tesla later used, and Vassilatos cites an 1872 Elihu Thomson/Houston experiment as an earlier sighting of Tesla's 'radiant' effect.

Key claims

• Connecting one pole of an induction coil to earth and the other to a large insulated conductor increases the quantity of the spark and lets long sparks be drawn from distant metal objects.
• A much larger insulated conductor would increase the effect further.

Relevance: Prior art for the earth-plus-elevated-conductor arrangement and for charging objects at a distance; supports the idea that Tesla's circuit had precursors.

Mainstream conflict: None; the effect is ordinary capacitive coupling and earth-return currents.

Tesla's reply to Vilhelm Bjerknes's resonator experiments (Electrical Engineer, 14 Dec 1892). He does not dispute Bjerknes's conclusions but adds that in air an oscillator and resonator lose energy by 'electric sound waves' or 'sound-waves of electrified air': charged air molecules are driven back and forth normal to the charged surface and carry off energy even through thick insulation. He assumes the loss goes as the square of the surface electric density times the frequency, rising rapidly for very thin wires, but flags that atoms may saturate at a maximum charge, which would break the law, and says quantitative data are lacking. Observations cited: Ayrton and Kilgour on thin-wire emissivity, the Crookes radiometer in an alternating field, a thin platinum wire that fused, impacts felt six feet from a short thick bar carrying battery discharges, a glass plate that sounds near a charged condenser, and a two-inch depression in an oil surface under a point. The word 'longitudinal' does not appear; the waves are mechanical waves of charged air, not ether waves.

Key claims

• Energy of a high-frequency oscillator or resonator in air is dissipated by 'electric sound waves' of electrified air.
• The dissipation is proportional to the square of the surface electric density and to the frequency.
• Air dissipation is more rapid than in a continuous medium such as oil, and makes magnetic metals behave differently from non-magnetic ones in Bjerknes's tests.

Relevance: The primary text behind the 'electric sound waves' / longitudinal-wave thread in the secondary literature (Vassilatos cites it as the 'pivotal' lecture); it shows Tesla's mechanism is air-molecule convection, not an ether wave.

Mainstream conflict: Corona, ion wind, acoustic emission and ordinary radiation are standard explanations; no derivation or numbers support the sigma-squared-times-frequency law.

Tesla's 1893 lecture. After an opening on the eye as the one organ directly affected by the medium that fills space, he describes his methods of conversion (condensers charged from DC or AC discharged through a magnetically blown-out or warm-air gap, so that with no oscillation the impulses are unidirectional; 'frequency alone does not mean anything'), then 'electrostatic force' experiments (streamers from a body at about 200,000 V, a bulb broken by agitation of gas molecules), current phenomena without a return circuit (a lamp lit from one terminal, single-wire motors, ground connections 'better than a return wire' at high potential), impedance phenomena (lamps lit across thick copper bars), resonance (the limit set by losses; 1,000 V raised 50-fold, 2 V possibly many hundred-fold), and the passage proposing to disturb 'the electrostatic condition of the earth' with a source grounded to the water mains and an insulated body, to transmit 'intelligible signals or perhaps even power to any distance'. The rest covers light effects: gas bombardment, button lamps, phosphorescence, an 'ether is atomic or continuous' question, and Tesla's statement that his explanations are 'in the spirit of a student prepared to find a better interpretation'.

Key claims

• It is practicable to disturb, by powerful machines, the electrostatic condition of the earth and transmit intelligible signals and perhaps power to any distance.
• In a disruptive-discharge circuit the important quantity is the rate of change per unit time, not the frequency.
• At high frequency and potential a lamp or tube can be lit from one terminal or with no leading-in wires, and ground connections are better than a return wire.
• The more rapidly a button is bombarded, the more economically it is kept incandescent; light production needs powerful electrostatic effects.

Relevance: Tesla's own statement of the earth-resonance idea and of 'electrostatic' (not Hertzian) effects, plus the origin of the unidirectional-impulse conversion circuit that Vassilatos and Lindemann read as 'radiant energy'. The text itself describes oscillating discharges and says unidirectional discharge arises when oscillation is avoided.

Mainstream conflict: Statements about resonance, single-wire transmission and earth capacity are exploratory and untested here; the claim of a low-energy disturbance felt all over the globe conflicts with later estimates of earth-ionosphere losses.

O'Neill's admiring biography, written with Tesla's cooperation by a friend and fellow journalist. It covers childhood (visualisation, the baitless hook, the 'sixteen-bug' motor, the vacuum-box experiment), Graz and Budapest (the rotating field in a city park, February 1882), Strasbourg, Edison, the Westinghouse contract ($1,000,000 and the royalty waiver), the Ferraris priority dispute, Niagara, the 1891-93 lectures, the 1895 laboratory fire, the Houston Street oscillator and the Madison Square Garden demonstration (1898), Colorado Springs (3 July 1899 stationary waves; the first man-made lightning and burn-out of the powerhouse dynamo), Wardenclyffe, the disc turbine and Allis-Chalmers (quoting Dahlstrand), the Edison Medal, the death-ray chapter, Tesla's views on mind and 'automata', and daily habits. The deep-read chapter 9 reports Tesla's tubes and claims for him priority in cosmic rays, artificial radioactivity, the atom smasher, the electron microscope and X-rays; for most O'Neill cites no document, admits 'the records of the experimental methods are not available', and reads later physics back into Tesla's words (e.g. 'disintegration' of an electrode as atom smashing). In this edition p.244 (O'Neill's p.277 in the 1944 edition per the FBI) says 'Operatives from the Federal Bureau of Investigation came and opened the safe in his room and took the papers it contained' and p.243 that 'all Tesla's records were sealed by the Custodian of Alien Property'. Second deep read (pp.153-185, 209-221): O'Neill quotes at length Tesla's 1904 Electrical World and Engineer account of the 3 July 1899 stationary waves (the storm observed out to about 300 km, Lowenstein as second observer) [read: pp.157-160]; the 1899 'tidal wave' report (48.5 s over 10 miles is sound travel time, 331.8 m/s), the burn-out of the power-house dynamo and the coil data (100-135 million volts, spark 135 feet) are O'Neill's narration with no source, and his voltages are 5-10 times Tesla's own published figures (12 million volts in 1900, about 20 million in 1917) [pp.156-170]. The 26-mile claim [p.171]: 'By piecing together the fragmentary material published in a number of publications ... it appears evident that Tesla ... tested his power transmission system at a distance of twenty-six miles from his laboratory and was able to light two hundred incandescent lamps, of the Edison type, with electrical energy extracted from the earth while his oscillator was operating ... He claimed an efficiency of higher than 95 per cent.' It is O'Neill's inference, with no publication named; the 50 W per lamp (10 kW, about 13 hp) is his arithmetic. The next page quotes Tesla's own June 1900 caveat that he had 'not as yet actually effected a transmission of a considerable amount of energy ... to a great distance' [p.172]. Candidate sources found in the project documents: '200 incandescent lamps' appears in the World System prospectus as a current passed 'around the Globe' [p.183]; 96-97 per cent is Tesla's 1917 Edison Medal figure; documented Colorado lamp tests are at 60-100 feet (Century 1900; Colorado Springs Notes, January 1900); no 26-mile source was found, and in 1916 Tesla put the Colorado receiver distance at 'Oh, 10 miles or so'. Valone repeats the 26 miles twice, citing O'Neill and Cheney; those are not independent. The World System prospectus [pp.182-184, undated, c.1901-1904, a promotional document by Tesla]: the Magnifying Transmitter 'passed a current, sufficient to light more than 200 incandescent lamps, around the Globe'; 'careful tests and measurements ... in Colorado ... power in any desired amount can be conveyed clear across the Globe if necessary, with a loss not exceeding a few per cent'; first plant in nine months, up to ten million horsepower. Death-ray statements [pp.209-215]: Tesla's 1933-34 press statements, the July 1934 letter ('Rays of the requisite energy cannot be produced ... Not so the agent I employ'), O'Neill's 1937 story (beam 10^-5 cm across; Tesla told other papers 10^-6 square cm, a gap of about 12,700 times in area), range 200 miles, 50 million volts, the 1938 Immigrant Welfare text ('energy ... flashed through interstellar space to any distance without the slightest dispersion'; prize claim for communication with other worlds). O'Neill saw no apparatus or data and says so; he also says he withheld some Tesla statements on atomic energy [p.218]. O'Neill's claim that the Colorado records 'never will be told' [pp.170-171] is overtaken by the published Colorado Springs Notes (1978).

Key claims

• Tesla discovered cosmic rays, artificial radioactivity, the principle of the cyclotron, the point electron microscope and X-rays-type 'very special radiation' in the early 1890s (O'Neill's reading).
• Radio 'is the product of the genius of Nikola Tesla'; Marconi's ground-and-antenna was exactly what Tesla had described in 1893.
• On the Colorado storm of 3 July 1899 Tesla observed stationary waves in the earth, proving it could be set into resonant electrical vibration.
• FBI operatives opened Tesla's hotel safe on his death and took the papers (O'Neill 1944; the FBI denies it).
• A beam weapon with a 200-mile range could be built with a plant of $2 million (via NYT 1940).
• Tesla tested wireless power at 26 miles from his laboratory, lighting 200 Edison lamps (about 10 kW) with energy from the earth at 'higher than 95 per cent' efficiency (O'Neill 1944, p.171; no source named; Tesla's own 1900 caveat is on p.172).
• The Magnifying Transmitter passed a current sufficient to light more than 200 lamps around the Globe, and Colorado tests showed power can be sent across the globe with a loss 'not exceeding a few per cent' (World System prospectus quoted by O'Neill, pp.182-183; Tesla's promotional text).
• Tesla said in 1938 that energy 'can now be flashed through interstellar space to any distance without the slightest dispersion' (quoted by O'Neill, p.214-215; no technical detail given).

Relevance: The most-cited biography; the source of many priority claims, the Colorado narrative and the Dahlstrand quotation. O'Neill is an advocate, so quotations are strong and his glosses are weaker. The FBI-safe sentence is the one the FBI file disputes.

Mainstream conflict: Many priority claims conflict with the historical record: Hess (1912) discovered cosmic rays, Mueller (1936) the field-emission microscope, Joliot-Curie (1934) artificial radioactivity, and Tesla's 'disintegration' means ejection of electrode material. Hertz-wave and radio-priority claims are contested. The 26-mile, 200-lamp, >95 per cent test has no primary record in the folder; wireless transmission at that distance with that efficiency conflicts with the loss budget at Tesla's working frequencies. O'Neill's date for the 1904 article ('May 5') and for the return from Colorado ('fall 1899') are wrong (March 5, 1904; January 1900 or later).

A hobbyist reference sheet for building Tesla coils: a dielectric-constant and puncture-strength table for many materials, equations for the tank capacitor and primary (impedance Z = E/I; C = 1/(2 pi Z x 0.00006) for 60 Hz; plate, Leyden jar, series and parallel capacitor formulas), LC resonance f = 1/(2 pi sqrt(LC)), a flat-coil inductance L = a^2 n^2/(8a + 11w), turns and wire-length rules (quarter-wave using 300,000 km/s), sphere and toroid capacitance, a schematic (NST 15 kV/30-60 mA, safety gap, 0.01-0.02 uF primary capacitor), a bibliography (Trinkaus, Couture, Curtis and others) and seven safety warnings. No Tesla claims.

Key claims

• A Tesla coil rings best when the primary LC and secondary circuit are tuned to the same frequency (f = 1/(2 pi sqrt(LC))).
• Wire length for a coil resonant at f (kHz) is about 300,000/f times a geometric factor (quarter-wave rule).

Relevance: Practical design aid and bibliography for the reader who wants to build and test a coil; no theory of Tesla's disputed claims.

Mainstream conflict: None; standard circuit formulas (some equations are garbled in the text layer).

A compilation of Tesla's writings in chronological order, from the 1888 motor letters, 1890 hysteresis and Swinburne exchanges, 1891 Thomson controversy, and 1892 'Dissipation' letter to 1896 X-ray (Roentgen) letters, the 1898 submarine destroyer and 'My submarine destroyer', the 1899 Electrical Review account, 1901 (variable capacity, wireless light, Talking with Planets), the 1904 Kelvin fuel debate, the 1905 peace article, 1907 'Tidal Wave', Mars signalling, 1908-1912 forecasts, 1912 'Disturbing Influence of Solar Radiation', 1914-1919 patent-wrapper pages, and 1919-1939 articles (Famous Scientific Illusions, Moon's Rotation, Can Radio Ignite Balloons, 1929 Herald Tribune, 1931 'Our Future Motive Power', 1934 'Possibilities of Electro-Static Generators', 1937 prepared statement with 'dynamic theory of gravity' and cosmic rays). Quantitative claims in the deep read: loss of 'a small fraction of one per cent' over 12,000 miles; earth period 'twelve times a second'; magnifying-transmitter results of sparks over 100 feet, 1,000 A, about 20 million volts; 10,000 hp to be ready 'next fall' (1905); speed of earth current averaging pi/2 times c; 25-70 km stationary wave lengths; Mars signalling ratios of '16,400,000,000' (recomputed 1.64e13), 75,000 hp arc plant, 800,000,000 hp wave activity. The word 'longitudinal' does not occur in pp.76-140; Tesla rejects 'transversal ether-undulations' and a 'weightless, structureless ether' in favour of a 'ponderous medium of coarse particles'. Many items are Tesla's own claims published while seeking funds and priority against Marconi; no data tables are given. Second deep read: Tesla's planetary-signal claims in date order. Collier's Weekly, 9 February 1901, 'Talking with Planets': from the Colorado laboratory he could 'feel the pulse of the globe' within eleven hundred miles; the changes 'were taking place periodically, and with such a clear suggestion of number and order that they were not traceable to any cause then known to me'; the thought of intelligent control came 'some time afterward' and he writes of a 'feeling constantly growing' that he had 'been the first to hear the greeting of one planet to another' while saying he 'could not decipher their meaning' [PDF pp.68-71]. The 1901 text does not say the signals repeated numbers; later retellings are firmer: 1919 Herald (signals 'in regular succession', possibly Mars), 1921 Electrical World ('a regular repetition of numbers', 'must have emanated from Mars'). 1907 (letter of 21 June printed 23 June, PDF p.111): the magnifying transmitter 'passed a current of one hundred amperes around the globe'. 1915: voice projected across the globe in 1899 (PDF pp.136-137). 1937: a new apparatus by which energy 'can now be flashed through interstellar space' (PDF p.281). 1929 (reporter's paraphrase): Tesla 'transmitted a considerable amount of electrical current to the other side of the earth' at Colorado. All are Tesla's own published words, made when he sought funds, priority or a prize; no laboratory record of the number-like signals, the 100-ampere circuit or the 1899 voice transmission appears in these pages.

Key claims

• Electrical energy can be economically transmitted without wires to any terrestrial distance with a loss not exceeding a small fraction of one per cent, even to the antipodes.
• Stationary waves in the earth show current going to the opposite side of the globe and returning with virtually undiminished force.
• The Maxwellian hypothesis of transverse ether undulations is no longer believable; electrical vibrations are carried by a medium of particles.
• Mars can be signalled with electrical power far more effectively than with mirrors; planetary disturbances detected in 1899 'must emanate from Mars'.
• A voice was projected across the globe in 1899 Colorado experiments (stated in 1915).
• Cosmic-ray particles, not waves, explain phenomena Tesla said he predicted 15 years before others (1937).
• In 1899 Colorado receivers recorded periodic disturbances with 'a clear suggestion of number and order', not traceable to the sun, aurora, earth currents or atmospherics, which Tesla came to think might be 'the greeting of one planet to another' (Collier's, 9 Feb 1901; hedged: 'could not decipher their meaning').
• Tesla stated that his magnifying transmitter passed a current of one hundred amperes around the globe (1907) and that a voice was projected across the globe in 1899 (1915); no record of either test is in these pages.

Relevance: Tesla's own public statements from 1888 to 1940, the evidence for what he claimed and when. All quantitative performance claims are his; none comes with a method or data table.

Mainstream conflict: Near-lossless earth conduction to any distance conflicts with ground-wave and ionospheric loss; the Mars figures are internally inconsistent; the 'dynamic theory of gravity' and mass-less energy claims conflict with relativity and nuclear physics.

A retyped booklet containing Tesla's autobiographical series (chapters 1-6): childhood, imagination and visualisation, near-death escapes, the Real Gymnasium, Graz and the Gramme dynamo objection (Prof. Poeschl: 'a perpetual motion'), the 1882 Budapest park inspiration for the rotating field (drawing in the sand while reciting Faust), Strasbourg, Edison and the SS Oregon, the Magnifying Transmitter and World System (sparks over 100 feet; a 187-foot Long Island tower with a 68-foot terminal; a claim of 'about 100,000,000 volts' with a conical coil in spring 1893), his nervous breakdown, his 'automaton' theory and a 1916-era statement against government monopoly of wireless, telautomata and flying machines. Includes the 1896 multi-function machine, a 12-inch bulb that delivered 1,000 flashes and Tesla's psychical account of his mother's death. Same text as the PDF version (eBook - The Strange Life of Nikola Tesla.pdf).

Key claims

• The rotating magnetic field came as a sudden vision in Budapest in 1882 and Tesla then built the whole system mentally.
• The Magnifying Transmitter and World System would give instantaneous wireless transmission of messages and power.
• Tesla's own thought and actions are controlled by external impulses (the automaton theory).
• Tesla reached about 100,000,000 volts in 1893 (stated as the voltage of a lightning flash).

Relevance: Tesla's own autobiographical statements (secondary reprint but primary content), valuable for his method of mental invention and for the World System claims. Duplicate of the PDF edition.

Mainstream conflict: The 100 MV figure and instantaneous world transmission are unsupported claims; mental-visualisation accounts are anecdotal.

Martin's 1894 compilation. Part I (polyphase): Tesla's 1888 AIEE paper 'A New System of Alternate Current Motors and Transformers' with the rotating-field reasoning, synchronising and torque motors, condenser motors, the polyphase transformer and the shielded constant-current transformer. Part II (high frequency and high potential): the 20 May 1891 AIEE lecture, the 1892 London and Paris lecture (including the 'wheelwork of nature' passage and the oscillating coil), the 1893 lecture, and chapters on a vacuum-tube exchange with J. J. Thomson, the 'Massacre' article on high-frequency effects on the body. Part III: direct from alternating currents, oil condensers, electrolytic meter, thermomagnetic motors and pyromagnetic generators, anti-sparking commutator, auxiliary-brush regulator, dynamos and motors, the direct-current arc system, and the unipolar dynamo with 'Notes on a Unipolar Dynamo'. Part IV: World's Fair exhibit and the 1893 mechanical and electrical oscillators. The deep read lists many quantitative claims (e.g. 1 MHz electrostatic force; 200,000 V streamers; resonant rise from 1,000 V to 50 times; earth capacity under 1/1000 farad; alternators of 384 or 480 poles at 10,000-30,000 'alternations' per second, which are pole passages and half-cycles). It finds no claim of output exceeding input in pp.341-416.

Key claims

• A rotating field from two currents out of phase can drive a motor without a commutator and with an efficiency equal to or above direct-current motors.
• The earth may be used instead of a return wire; 'intelligible signals or perhaps even power' can be transmitted to any distance by disturbing its electrostatic condition.
• High-frequency light is more economical, with short thick filaments and smaller currents.
• Throughout space there is energy, and it is a question of time when men will attach their machinery to the very wheelwork of nature (London lecture 1892, printed p.236).
• Resonant voltage can be raised 50-fold from 1,000 V, but not ten-fold from 100,000 V because of losses.

Relevance: The best single primary source for Tesla's 1888-1893 work in his own words. It shows that the 'wheelwork' passage belongs to the 1892 London lecture, not the 1891 lecture.

Mainstream conflict: The polyphase material is mainstream and foundational. High-frequency, single-wire and earth-resonance statements are exploratory; 'alternations' figures are pole passages so frequencies are half the stated numbers.

Nichelson argues that Tesla's 1900 'sink' for ambient energy does not violate the second law. Steps: Tesla's cylinder with a low-energy medium inside; the water-tank pumping analogy (pumping out and letting back gains 'not a bit more'); the conversion loophole (water decomposed into oxygen and hydrogen so the tank stays empty, 'any amount of energy without further effort'); rods from earth to space as a thermopile; then the medium is recast as an 'electrical fluid'/aether with potential as temperature; a device that powers a load by displacement current with 'no conduction current, therefore with no expenditure of energy'; the bifilar coil as a Linde-type embodiment; Fig. 6 coil measurements (a peak of 0.97 at 11 MHz for the bifilar against 0.18 at 19.1 MHz for the single coil, a ratio of about 5, not 'several orders of magnitude' as the text says); a sizing example (100 W at 5000 V, 1000 Hz gives C = 1 nF). The deep read shows that the quotations omit Tesla's next sentences ('maintained by some process'; 'continuous pumping out'), Kelvin's 'coldest of' is dropped, volts and amperes are called 'quantities of the electrical fluid' (a unit error), the example stores only 0.0125 J against 0.025 J needed per quarter cycle, and after p.6 the medium is dropped and the only source left is a finite stored charge.

Key claims

• Tesla's energy 'sink' follows the second law because it extracts work from a medium by conversion rather than by cooling it below its surroundings.
• A device operated on displacement current with no conduction current can power a load with no expenditure of energy.
• A bifilar coil at resonance holds more charge and has several orders of magnitude greater voltage gain than a single coil.
• After an initial energy input a bifilar-coil electrostatic oscillator operates as a fuelless generator.

Relevance: The strongest statement of the thermodynamic argument for the fuelless generator, and a source of measured bifilar coil traces. The deep read lists exactly where the argument depends on an undefined medium or a maintained gradient.

Mainstream conflict: Claims net energy delivery without a fuel or a sustained gradient; conflicts with the first and second laws. The plotted data show less than one order of magnitude, with both ratios below unity.

An edited anthology on Tesla's wireless power and 'free energy'. Valone's introduction treats the earth as one spherical conductor and the ionosphere as another and says Tesla proposed a 'longitudinal' compression wave, not a transverse Hertzian one. Contents include Tesla biography chapters (Terbo, Tutt, Puharich), Niagara history, Van Voorhies on worldwide wireless power (earth-ionosphere cavity Q of 6-8, Schumann modes, coupling, safety), Grotz's Project Tesla, Corum and Corum on a 7.5 Hz ELF oscillator and the single-electrode X-ray tube, Rauscher and Van Bise on ELF impulses, Valone on the homopolar generator (his own 'closed circuit about 380 A' trials) and Tesla's ozonizer, and a glossary calling a transverse wave Hertzian and Tesla's electrostatic scalar wave longitudinal. The deep-read chapters: Nichelson's 'quantum energy' estimate (E = hf per electron at 7.5 Hz, 100 A, 'therefore 19-190 MeV'): arithmetic is right (3.1 pW) but Eq. (5) drops 'per second'; the per-electron energy is 3.1e-14 eV, so the 19-190 MV figure rests on a unit error, and the 7.5 Hz is Valone's editorial substitution for Nichelson's original kHz. The de Broglie remark mistakes the Compton wavelength for a classical wavelength. Bass's 'self-sustained longitudinal wave oscillations' (E parallel to B, Poynting vector zero) are correct standing vacuum solutions of Maxwell's equations of the Chandrasekhar-Kendall type; 'longitudinal' only means E parallel to B (the fields are divergence-free), 'transport force without attenuation' is asserted not derived, and the boundary-source equations are a sketch. Further deep reads. Tutt (ch.3): reports Tesla's own press statements (Brooklyn Eagle 10 July 1931 'I have harnessed the cosmic rays'; New York American 1 Nov 1933) with no device description; the endnotes are not in the extracted text; the Moray link is Tutt's inference. Corum and Corum (ch.12): sections 1-3 are correct textbook analogies (lever, transformer, damped oscillator, ring power multiplier); the 7.5 Hz figure is c divided by the earth's circumference from a model the authors call crude; the 0.08484 s echo is cited from their 1986 model, not derived; with the Zinke night attenuation they adopt, the predicted ring effect at 5 kHz is a 1.3 dB ripple and a multiplication of about 1.17; no experiment on the earth is reported. Rauscher and Van Bise (ch.14): ELF magnetic spectra recorded at San Leandro CA on 19-20 June 1987 (dominant 30.5-30.6 Hz) and a 30-31.4 Hz signal at seven cities, with an induction-coil magnetometer (three different coil wire lengths and two sensitivity specifications are printed); earthquake-precursor rule at 3.2 Hz and '84 percent accuracy' stated without statistics; Mt. St. Helens data described but not shown; the authors hold the detector patent (4,724,390); the Tesla link is numerological (pi/2). Van Voorhies and Grotz (chs.7, 9) on the earth-ionosphere cavity: 'The Q of the earth-ionosphere cavity is generally reported to be about 6-8 but Corum and Spaniol [48] indicate that a low Q cavity does not necessarily limit the practicability of wireless power. However, Sutton and Spaniol [49] found that the previously measured Q values were limited by instrument noise and using modern equipment they measured levels as high as 1000, which they say were also confirmed by others [50]' [PDF p.140]; ref. 49 is Sutton and Spaniol, a magnetic measurement of cavity resonances at 3-30 Hz, International Tesla Symposium 1988; ref. 50 is 'personal correspondence'; the book gives no instrument, site, date or method for the 1000. The same book prints the Corums' 1984 comparison (Grotz Fig. 4) with accepted cavity Q 3.8-7.8 and Q predicted from Tesla's disclosures 3.2-6.4, attenuation 0.20-0.30 dB per megametre. Grotz writes that 'The loss of power in the cavity has been estimated to be about 6% per round trip' [PDF p.162] with no estimator or calculation; that corresponds to Q of about 100 (or about 50 if it is an amplitude loss), inconsistent with both the conventional and the 1000 values. R. Golka's Project Tesla (begun 1968, Air Force contract) built a 51-foot coil and 130-foot tower at Wendover AFB, Utah (1973-74, used to 1982, 'over 600 kilowatts' capacity) and is said to have 'replicated Tesla's Colorado Springs transmitter and succeeded in operating it at twice Tesla's original power levels' [PDF p.139]; the 1986 Golka-Grotz proposal to excite the cavity at 7-8 Hz (predicted 46 pT at 150 kW) reports no result, and Van Voorhies writes 'Tesla's worldwide wireless power concept remains unverified' [PDF p.135]. Flowers 1925: John B. Flowers sent a 10-page proposal (Sketch A, a 60 Hz world system; Sketch B, a 300 m electrical ring model; a 20-inch balloon with standing waves at 29 Hz) to H. L. Curtis and J. H. Dillinger of the Bureau of Standards; 'The plan was declined' (Valone, citing Flowers's 16 July 1925 document as quoted in Exotic Research Report, July 1999); no Bureau reply is quoted, and H. L. Curtis is not Leonard E. Curtis of Colorado Springs.

Key claims

• Tesla's magnifying transmitter generated non-Hertzian longitudinal waves that move through the earth faster than light without electromagnetic radiation.
• The earth-ionosphere cavity is resonant at 7.5 Hz and multiples; Tesla excited it with pulses at about that rate.
• A 7.5 Hz quantum-wave calculation shows a potential of 19-190 million volts is needed, matching Tesla's reported voltages (Nichelson).
• Maxwell's equations admit self-sustained longitudinal (E parallel to B) vacuum oscillations (Bass), and these are the waves Tesla produced (editor's gloss).
• Resistanceless 'superfluid' current can maintain a generator without an external power source (Nichelson).
• Sutton and Spaniol (1988) measured earth-ionosphere cavity Q 'as high as 1000' and others confirmed it (second-hand via Van Voorhies, ref. 50 personal correspondence); the Corums' 1984 table gives accepted Q 3.8-7.8 and Tesla-derived Q 3.2-6.4.
• The earth-ionosphere cavity loses 'about 6% per round trip' (Grotz 1986/1997 proposal; no source or calculation given).
• R. Golka replicated Tesla's Colorado Springs transmitter at twice its power (Van Voorhies, citing Golka's unpublished paper and Radio-Electronics, Feb 1981); no excitation of the cavity or long-distance reception is reported.
• In 1925 J. B. Flowers proposed a test of Tesla's wireless system to the Bureau of Standards, which declined it (Valone, citing a 1999 newsletter quotation).

Relevance: The main secondary source for the longitudinal/scalar-wave reading of Tesla and for ELF earth-resonance proposals. It mixes editor's glosses with authors' work; claims about Tesla's apparatus come mostly from these later authors, not from Tesla.

Mainstream conflict: Longitudinal vacuum EM waves with E parallel to B exist mathematically but carry no energy (S = 0) and are not compression waves; quantum non-locality carries no signal; superconductivity needs the lattice and low temperature. The earth-ionosphere cavity modes (Schumann, about 7.8 Hz) are mainstream.

An advocate's design book on the disc (boundary-layer) turbine. The operating principle is stated as viscous drag between medium and discs, with no boundary-layer analysis. All historic performance figures are repeated without source (30 hp from a 10 lb, 6-inch, eight-disc air turbine at over 30,000 rpm in 1906; 200 hp at 9000 rpm and 125 psi on the 18-inch Waterside machine; a 500 kW, 60-inch Allis-Chalmers unit rated at 675 hp at 3600 rpm; 110 hp for a 9.75-inch machine at 9000 rpm and 125 psi, inconsistent with the 200 hp attribution). Cairns lists reasons for non-adoption (disc distortion by inertial force, a quoted '70,000 lb', poor efficiency against established types, need for reduction gearing, materials, lack of funds, competitors' interests). His own measurements are two no-load speeds of a half-size model (20,000 rpm at 1.75 bar and 1.5 cfm; about 50,000 rpm); he gives no torque, power or efficiency data. His 9.75-inch machine is a design only. He calculates disc stress by Roark formulas (his burst stress 3662 psi differs from the printed formula's 3259 psi) and proposes unbuilt automotive, aircraft and compressor designs.

Key claims

• A rotor of closely spaced smooth discs driven by viscous drag gives high power for its size and needs no vanes.
• A 6-inch disc turbine weighing about 10 lb developed about 30 horsepower on compressed air in 1906.
• The Allis-Chalmers 500 kW unit was dismissed for disc distortion and poor efficiency, but only a single non-condensing stage was ever tested.
• A 7-inch to 10-inch disc is the practical upper limit for solid discs at reasonable stress.

Relevance: A summary of the historic claims plus design arithmetic; it distinguishes what Cairns measured (almost nothing) from what he repeats.

Mainstream conflict: None in principle; the technique is real but historical efficiencies were not competitive. Performance claims for the unbuilt designs are projections.

Patent for a unipolar (homopolar) generator with two disks in opposite-polarity fields joined by a flexible conducting belt over flanged rims, so the terminal EMF is the sum of two disks' EMFs and rim-brush contact problems are avoided. Disks may be copper, brass or iron; shafts form the terminals; uses include exciter for alternators, motor and other dynamo uses. Three claims: two rotary conductors with a belt; flanged disks with a belt; independent sets of field magnets with independent drives. No output figures. This is the machine Nichelson reads as Tesla's first fuelless design.

Key claims

• Two unipolar disks in opposite fields connected by a flexible belt give an EMF equal to the sum of the two without rim-contact difficulty at high speed.
• The machine can serve as exciter, motor or generator.

Relevance: The patent behind the unipolar dynamo argument in Nichelson's 'fuelless' papers and Valone's homopolar chapter; the patent itself contains no self-sustaining claim.

Mainstream conflict: None; homopolar machines are standard (Faraday disc). Self-sustaining operation is a later reading.

The PDF form of the same booklet as TheStrangeLifeofNikolaTesla.txt: Tesla's autobiographical chapters 1-6 (early life, how he conceived the rotary field, the Tesla coil and transformer, the Magnifying Transmitter and World System, his collapse, the automaton theory, telautomata and the 'death of his mother' episode), with a later chapter noting his June 1900 Century article and the November 1898 basic telautomaton patent, a 12-inch bulb delivering about 1,000 flashes, and a predicted war between 'nations that fight without armies, ships or guns'. Tesla says he predicted the duration and main issues of the First World War in an article in The Sun of 20 December 1914.

Key claims

• The Magnifying Transmitter will prove the most valuable of Tesla's inventions for future generations.
• Tesla experiences himself as an automaton controlled by external forces of the medium.
• Radio-controlled telautomata and reaction-driven flying machines will make future wars machine contests.

Relevance: Duplicate edition of the autobiography text; use for Tesla's own account of mental invention and his own description of the Magnifying Transmitter.

Mainstream conflict: None (anecdotal autobiography); World System and 100 MV claims are unsupported.

Build instructions for a battery or mains-powered flyback-transformer 'Tesla coil': ten turns of #18 centre-tapped primary and four turns of feedback winding on a TV flyback core driven by two 2N3055 transistors, 12 V 4 A supply, output on a door-knob terminal. It lights a 20 W fluorescent lamp without wires and gives corona to about one inch. No performance data beyond the qualitative demonstrations; component values partly unreadable.

Key claims

• A 12 V supply and a TV flyback transformer can make a solid-state high-frequency, high-voltage device that lights a fluorescent lamp without wires.
• The output gives a purplish corona arc of about one inch.

Relevance: Related hobbyist work on solid-state coils (compare Trinkaus); no new claims.

Mainstream conflict: None; standard flyback-oscillator hobby project (it is a flyback driver, not a resonant Tesla transformer in the strict sense).

A hobbyist's guide to building an AC resonant-charging spark-gap Tesla coil: variac, RFI filter wired in reverse, neon sign transformer, power-factor capacitor, Terry filter, safety gaps, separate RF ground (not the mains ground), static and rotary gaps, tank capacitor (1-50 nF, rated 2-3 times NST RMS), primary types (spiral, helical, inverse conical), strike rail, secondary 5-7 times diameter with about 1,000 turns, toroid top load, Medhurst capacitance and resonance matching. States 'the true physics is still not completely understood but can be modelled experimentally'. All equations are missing from the extracted text.

Key claims

• Primary and secondary circuits must have the same resonant frequency for 'resonant climbing' of voltage.
• The RF ground must be separate from the mains ground.

Relevance: Practical background on how modern Tesla coils are built; no evidence on Tesla's disputed claims.

Mainstream conflict: None (the 'true physics not completely understood' remark is an overstatement; coupled resonant circuits are well modelled).

Tesla's first major lecture. Opening: 'Nature has stored up in the universe infinite energy. The eternal recipient and transmitter of this infinite energy is the ether'; electricity is 'ether associated with matter' (single-fluid view, crediting Franklin and Lodge); all electrostatic, current and magnetic phenomena are due to electrostatic molecular forces. He criticises Hertz and Lodge for concentrating on electromagnetic effects, says long transverse waves cannot excite gas luminosity, and aims at 'powerful electrostatic effects' of high frequency (alternators giving over two million reversals per minute; 384-pole and 480-pole machines; typical 20,000 alternations per second) and high potential. He demonstrates five forms of coil discharge, streamers heating a wire, single-terminal lamps, tubes lit without electrodes in an alternating electrostatic field, a room lit by suspended plates, impedance effects (lamps lit across thick bars) and condenser conversion. He says resonance helps qualitatively but cannot supply enough energy at a distance by the electromagnetic route, and calls for a converter of heat into high-tension electricity. The deep read finds no 'wheelwork' or 'hitch our wagon to a star' passage (the correct source of 'wheelwork of nature' is the 1892 London lecture). The closing paragraph is the 1891 counterpart: 'there is a possibility of obtaining energy ... in some more direct way from the medium'. No lamp efficiency figure is given and no wireless power or resonant earth transmission appears.

Key claims

• Light is produced primarily by rapidly alternating electrostatic force acting on molecules, not by electromagnetic waves.
• A vacuum tube or lamp can be lit with no connection to anything in an alternating electrostatic field.
• Energy may be obtained more directly from the medium 'some day' (stated as a possibility only).
• High frequency and potential permit light of far higher efficiency than ordinary lamps (no number given).

Relevance: Primary source for Tesla's electrostatic-light programme and for the first form of the 'energy from the medium' statement; corrects the usual attribution of the 'wheelwork' phrase.

Mainstream conflict: The ether-as-electricity picture and the claim that radiation from Hertz-type apparatus is a very small fraction of energy are superseded; the demonstrations are real high-frequency effects.

Tesla's 1900 essay: human energy as 1/2 M V^2 and the three ways to increase it (mass: food by burning atmospheric nitrogen with electric discharges; reducing retarding forces: peace through telautomata and machine warfare; increasing the accelerating force by harnessing the sun's energy). Technical sections: iron and aluminium, electric transmission of coal, gas engines, 'Energy from the medium' (windmill, solar engine at over four million horsepower per square mile, terrestrial heat), then the 'self-acting engine'. The self-acting-engine argument in full [read: reprint pp.19-22]: (1) a thermopile of metal bars from the earth to outer space would run a motor 'until the media below would be cooled down to the temperature of the outer space'; (2) a water analogy: a 'sink' or 'cold hole' pumped out in a lake would, if the water simply ran back, return exactly the work spent pumping and 'not a bit more', 'consequently nothing could be gained'; (3) but heat is not a fluid, 'it is energy which may be converted into other forms of energy as it passes from a high to a low level'; if conversion were absolutely perfect all the water would be decomposed into oxygen and hydrogen before reaching the bottom and the tank would stay empty, so any amount of energy could be had without further effort; (4) 'We do not know of any such absolutely perfect process of heat-conversion, and consequently some heat will generally reach the low level ... necessitating continuous pumping out. But evidently there will be less to pump out than flows in, or, in other words, less energy will be needed to maintain the initial condition than is developed by the fall, and this is to say that some energy will be gained from the medium. What is not converted in flowing down can just be raised up with its own energy, and what is converted is clear gain. Thus the virtue of the principle I have discovered resides wholly in the conversion of the energy on the downward flow.' So Tesla himself claims a partial net gain from the ambient medium in the same paragraph as the caveat; the caveat limits the size of the gain, not its existence. He then reports the programme: a combination of five essential elements, of which he names the mechanical oscillator (a free-piston vibrating engine, shown at the 1893 Chicago World's Fair, 'the original purpose of this machine is explained here for the first time') and an air compressor (completed at the close of 1894); the third element, a refrigerating machine, was interrupted by the 1895 laboratory fire; Linde's self-cooling liquefaction of air was 'the only experimental proof which I was still wanting that energy was obtainable from the medium in the manner contemplated by me' [read: pp.21-22]. Caveats in his own words: 'I cannot hope to produce a self-acting machine deriving energy from the ambient medium for a long time yet' [p.22]; with liquid air 'a certain amount of energy may be gained from the engine, or ... from the ambient medium which keeps the engine warm ... But this gain of the consumer is offset by an equal loss of the producer' [p.22]; commercial profit 'will not be so to an extraordinary degree' [p.22]; later 'It is probable that we shall soon have a self-acting heat-engine capable of deriving moderate amounts of energy from the ambient medium' [p.33]. He also says a gravity-driven disk 'is perfectly impossible' without a force from outside, but allows a 'screen against this force' as a possibility 'until we know exactly the nature of the force of gravity' [p.19]. Colorado and wireless statements: single-wire and through-the-ground lamp lighting (a lamp lit with the oscillator at one fifth of one per cent of capacity; a grounded tuned coil lighting a lamp in an independent loop with the oscillator at five per cent; three lamps in a 50-foot square loop 100 feet from the primary at under five per cent; 'I have now no difficulty in lighting in this manner four or five hundred lamps, and could light many more' [pp.24-25, 30]); Fig. 8 sparks an inch long drawn from a water main 300 feet from the laboratory [p.30]; Fig. 10 'delivering energy at a rate of seventy-five thousand horse-power', 'pressure is over twelve million volts', 130,000 alternations per second, discharges 'probably more than one hundred feet long' [p.31]; the stationary-wave 'echo' from the earth [p.31]; 'I have observed the above effects so far only up to a limited distance of about six hundred miles' [p.32]; a distinct effect on Venus or Mars 'is beyond any doubt' and 'interplanetary communication has entered the stage of probability' [p.32]; air becomes conducting with rarefaction, so 'two terminals maintained at an elevation of not more than thirty thousand to thirty-five thousand feet ... fifteen to twenty million volts' could carry 'the energy of thousands of horse-power' over hundreds or thousands of miles [p.32]; 'While I have not, as yet, actually effected a transmission of a considerable amount of energy, such as would be of industrial importance, to a great distance by this new method, I have operated several model plants ... and the practicability of the system is thoroughly demonstrated' [p.32]; 'it matters little ... whether the transmission is effected at a distance of a few miles or of a few thousand miles' (said of the high-altitude scheme, not of ground conduction) [p.32]. Also: wireless transmission is now 'a rational task of the engineer'; Mars beings may have realised the idea [p.33]. Tesla was seeking funds and priority when he wrote it.

Key claims

• A self-acting engine drawing energy from the ambient medium is possible in principle by creating a 'sink' kept at low energy; because no perfect heat-conversion is known, continuous pumping is needed, but 'less energy will be needed to maintain the initial condition than is developed by the fall', so 'some energy will be gained from the medium' (Tesla's partial net-gain claim, reprint p.21).
• Tesla says he cannot hope to produce such a machine 'for a long time yet' (p.22) and, in the same article, that 'we shall soon have a self-acting heat-engine capable of deriving moderate amounts of energy' (p.33); in the liquid-air case the consumer's gain is 'offset by an equal loss of the producer' (p.22).
• Air at ordinary pressure becomes conducting under impulses of very high electromotive force and more so with rarefaction, making wireless transmission of power a rational engineering task (a path between terminals at 30,000-35,000 feet with 15-20 million volts).
• The earth responds to electrical oscillations from the sender (stationary waves, 'a wave reflected from afar') and effects were observed to about 600 miles (p.31-32).
• As of June 1900 Tesla 'has not, as yet, actually effected a transmission of a considerable amount of energy ... to a great distance', but has operated 'several model plants' (p.32); lamps were lit by ground-transmitted vibrations (up to 'four or five hundred lamps' by the single-wire/induction method).
• Commercial profit from harnessing the sun would be real but 'not extraordinary' (p.22).
• Tesla states the second law, after Carnot and Kelvin, as 'impossible for an inanimate mechanism or self-acting machine to cool a portion of the medium below the temperature of the surrounding, and operate by the heat abstracted' (p.19); his paraphrase leaves out Kelvin's 'coldest of the surrounding objects', and his thermopile from the earth to outer space (pp.19-20) is an ordinary two-reservoir heat engine that Kelvin's wording allows.
• Tesla's chronology for the self-acting engine (pp.21-22): sink scheme concluded in Paris in the latter part of 1883; work resumed 1889; Dewar's liquefied-gas experiments seen in London early 1892; the mechanical oscillator shown at the Chicago Electrical Congress in summer 1893; oscillator plus air compressor working by the close of 1894; a third element (refrigerating machine) just begun when his laboratory burned; elements four and five are not named.
• No measured output, efficiency or test of the self-acting engine appears in pp.15-24; Tesla calls Linde's self-cooling liquefaction of air 'the only experimental proof which I was still wanting' (p.22).
• The solar input figure 'over four million horsepower per square mile' (p.18) equals about 1,150 W/m^2, between the clear-sky surface peak and the solar constant; the claim of 'thirty times as much aluminium as iron in bulk' (p.16) is unexplained (crustal ratio about 1.4).
• Tesla reports building a limestone engine (carbonic acid released by sulphuric acid) that 'operated satisfactorily', with no figures, and complete lack of success with a cold carbon battery (p.17); both are chemical-energy devices, not ambient-heat devices.
• Tesla reports two 'novel facts' (pp.18-19): a current flows in a wire from the ground to a great height with a pointed terminal, driven by the earth's movement, and the upper air is permanently charged opposite to the earth, making earth, air and upper strata a charged condenser.
• In diagram b (p.20) the enclosure is 'an enclosure T'; the word 'cylindrical' is a bracketed insertion in this reprint, not demonstrably Tesla's.

Relevance: Tesla's most comprehensive statement of the energy-from-medium idea; the primary text for the thermodynamic argument Nichelson and Lindemann cite. Earlier review files said the text was 'consistent with the second law' because the quotation was cut at the caveat; the full paragraph claims a partial net gain (see claims.md, Corrections). It also holds Tesla's own June 1900 statement that no considerable amount of energy had yet been sent to a great distance.

Mainstream conflict: The self-acting engine as stated 'seemed contrary to Carnot and Kelvin' (Tesla's words) and the partial-gain step ('what is converted is clear gain') conflicts with the second law of thermodynamics; the mathematician's Carnot calculation (cost of re-pumping the unconverted heat equals the work gained) rules it out. The Colorado claims (100-foot discharges, 75,000 hp, conduction at altitude) are unverified by independent measurement.

A two-page paper on two 4-inch, 43-turn air-core coils, one conventional (L = 207.92 uH, resonant at 19 MHz) and one series-bifilar (L = 205.06 uH, 11 MHz). It defines voltage gain as X_L/R = 2 pi f L/1 (R silently taken as 1 ohm), giving 25 x 10^3 and 14 x 10^3 (ratio 0.57 predicted). The measured analyser traces (HP 3577 network analyser, S21 through the coil) peak at 0.18 (19.1 MHz) for the single coil and 0.97 (11 MHz) for the bifilar, a ratio of 5.39, called 929% of theory (5.39/0.57 is 946%). Capacitance appears nowhere in the calculation; it enters only through the lower resonant frequency of the bifilar coil, which implies roughly three times the effective capacitance (about 0.34 pF against 1.02 pF if treated as lumped). The plot is a transmission ratio between 0 and 1, not the quantity X_L/R, and the bifilar curve is broad, not a high-Q peak.

Key claims

• A series bifilar coil shows a measured peak transmission ratio about 5.4 times that of a single-wound coil of equal inductance.
• The measured gain is 929% of the gain expected from X_L/R.

Relevance: The only measured data in the folder on the bifilar-coil 'voltage gain' claim that Nichelson ties to US 512,340. The measurement shows a transmission ratio below unity, not net energy gain; the comparison with X_L/R assumes equal series resistance.

Mainstream conflict: Extra distributed capacitance in a bifilar coil is expected; a transmission ratio below one is not a gain. The comparison of a reactance-over-resistance estimate to an analyser trace is not like for like.