Morton-Wall: Physicist review (Step 2)

Reviewer: PhD physicist. Date 2026-10-08. Project: Houston's 1871 "New Connection for the Induction Coil" and Wahl's 1871 "A Large Induction Coil" (Morton's Ritchie coil), Journal of the Franklin Institute (JFI) vol. LXI.

Tags: [read] from a document (page given), [read: page image] from a rendered page, [web] with URL, [memory] with confidence. Page numbers are PDF pages of the project file unless "j." (journal page) is given.

Reader note (undergraduate level assumed). Terms used below, defined once: - Induction (Ruhmkorff) coil: a transformer. A battery current in a few hundred turns of thick "primary" wire is interrupted by a "break"; the collapsing flux induces a very high voltage in a "secondary" of tens of miles of fine wire. The output is a short, damped, oscillating high-voltage burst at every break, not a steady voltage. - "Spark length" is how coils were rated (a "6 inch coil" jumps 6 in of air). It is a rough voltmeter: higher voltage, longer spark. - "Quantity" (1870s word): the amount of charge or energy in a single spark, judged by eye as thickness, brightness, loudness. "Tension" (old word) is voltage. - Capacitance C: charge stored per volt, Q = CV. Energy stored: E = (1/2) C V^2. An isolated conductor has a capacitance to its surroundings (a sphere of radius r in air: C = 4 pi eps0 r, with eps0 = 8.85e-12 F/m). A Leyden jar is a glass-walled capacitor.

Source check and Corrections to Step 1

I re-read Houston's note (PDF pp.594-596, text layer, and the project's deep read), Wahl's article (pp.319-323, text layer and page images at 150 and 300 dpi), and the Investigator's downloads: Houston Jan 1876 and Houston and Thomson April 1876 (JFI vol. 101), Morton 1867 (JFI vol. 83, pp.256-260), Woodbury 1944 and Atherton 1984. No source gap: the readable text is good. The 1871 note has no equations, no tables, no figures, and no measurements by instrument.

Corrections to Step 1 (facts.json, claims.md, deep read) and to the Investigator

1. Wahl's wire length and weight are misread. facts.json and claims.md (claim 5) say the Morton coil has "443 miles of secondary wire, 250 lb" and the secondary weighs "443 lb". The page images show otherwise [read: page image pp.320, 321]: "containing but 44 1/3 miles of wire" (p.320) and "The secondary wire is 234,100 feet, or about 44 1/4 miles, ... and weighs 44 1/4 pounds" (p.321, j.214). The OCR turned the fractions into digits ("443", "444"). The unit check proves the page reading: 234,100 ft / 5,280 ft per mile = 44.3 miles, not 443. The weight check agrees: 0.007 in copper wire is 3.85e-5 in^2 in cross-section, so 1 ft weighs 1.48e-4 lb (copper 0.321 lb/in^3 [memory, high]); 234,100 ft is 34.7 lb bare, about 44 lb with silk covering. The coil's whole weight is "about 250 pounds" (p.320), packed 355 lb (p.321). A 443 lb secondary would have exceeded the whole instrument. Wahl's comparison is therefore 44 miles of wire for 21 in against App's 150 miles for 29 in, which is Wahl's point (the Ritchie coil is the more efficient). Cross-check from outside: Wikipedia lists Spottiswoode's later Apps coil at 280 miles for 42 in [web] https://en.wikipedia.org/wiki/Induction_coil ; 443 miles giving only 21 in would have been out of line, 44 miles giving 21 in is in line.
2. Other OCR misreads on the same pages [read: page image]: the condenser holds 325 sq ft of tin foil, not 825 (p.321); the primary wire is 0.1655 in, not 0.1635; the core wires are "1/8" in; the secondary bobbin sections are 13 in long, not 18 (p.321). The Leyden jar "of 14 square feet surface" is in fact "1 1/3 (or 1 1/4) square feet" and its sparks are "2 3/4 (or 2 3/8) inches", not 2 in (p.322, j.215). The fractions are small in the image; I give them as read, with that doubt. facts.json item 2 and claim 6 repeat the wrong jar figure ("14 sq ft jar", "2 in"). A 1 1/3 sq ft jar is physically a far smaller capacitor (about 2 nF, below) than a 14 sq ft one, which matters to the comparison with Houston's table.
3. Atherton's "30 m" is probably a unit slip, not a second observation. The Investigator cites Atherton (1984) for sparks "up to at least 30 m" [read: Atherton PDF, book pp.183-184]. Houston's 1871 note gives "fully thirty feet" (9 m) to the steam engine [read: p.595]. The only longer distance in the record is Woodbury's 1875 rooftop story, "90 feet" (27 m) [read: Woodbury, book pp.63-67]. Atherton also joins two episodes (the 1871 tin-still connection and the 1875 graphite-pencil and brass-knob receiver) and dates Thomson's disproof of Edison "the next year". I could not see Atherton's own source. I record the "30 m" as unreconciled with Houston's text and likely 30 ft or 90 ft converted; the reader should not take 30 m from the 1871 experiment. Atherton, a secondary source, is not the origin of any number.
4. The Investigator's "Corrections" stand: the battery is absent from the 1871 note but given in 1876 (ten-cell "electro-poion", zinc between two carbon plates, about 3 x 6 in) for the December 1875 repetition [read: Houston 1876, j.60]. I add that 1876 also says "a Ruhmkorff induction coil ... six inches", the same rating as 1871's Ritchie, so it is plausibly the same instrument, not proved.
5. claims.md says Morton's secondary-condenser paper is missing; the Investigator found it (Morton 1867, JFI vol. 83, pp.256-260). It matters: Morton states there that "the introduction of a Leyden jar into the secondary circuit of the Coil, shortens the spark and increases greatly its brightness", calls this "well known to all", and gives numbers (one jar 1 in, six jars in cascade 4 in; an eight-plate tinfoil "cascade" box gives 5 1/2 in white, loud sparks from an 8 in coil) [read: Morton 1867, j.256-258]. So the spark-length versus quantity trade-off was already published four years before Houston; Houston's novelty was loading with a large conductor against the earth instead of a jar.
6. Source-label correction: the forum story (Kelly, "Practical Guide to Free-Energy Devices"; Energetic Forum) says "In 1872, Elihu Thomson ... any insulated metal object anywhere in the building would produce long continuous white sparks". Houston's June 1871 note says "within eight or nine feet", a stove and an engine, a room below [read: p.595]; "insulated", "anywhere in the building" and "continuous" are not in the 1871 note. The 1876 note adds a boiler on the floor below and gas pipes "in the adjoining rooms" [read: Houston 1876, j.59-60]. The forum text is a retelling that grew.

What mainstream physics says about this set-up (the standard view)

Everything below uses classical circuit theory and Maxwell's equations as known today. I give it first so that each claim can be compared with it.

Model. The coil's secondary is a large inductor (here L of some henries, since 44 miles of wire on an iron core). Its two terminals have small capacitances to everything around (the coil's own windings, the table, the building). At each break, the primary's stored magnetic energy E0 = (1/2) L_p I^2 is passed to the secondary and charges whatever capacitance C is attached to the terminals. The voltage rises until the air gap between the discharge points breaks down (V_b, set by gap length) or until the energy runs out. The discharge then rings: C discharges through the gap and the wire loop, with a frequency f = 1/(2 pi sqrt(L_loop C)) set by the small inductance of the leads, not the big secondary. That frequency is megahertz, far above the kilohertz of the coil's own secondary ringing.

Three facts follow, and they are the standard textbook account of a spark gap with a capacitor ("Leyden jar") and, later, of a spark-gap radio transmitter: 1. Added capacitance across or in the discharge path makes the spark shorter, thicker, brighter and louder, because the same energy is spent as a quick, intense discharge of more charge at lower voltage. (Morton 1867 and Plucker's spectra, cited by Morton, say the same: higher temperature, richer in ultraviolet.) 2. The ringing discharge carries megahertz currents. Conductors near it (pipes, a stove, a person) pick up the rapidly changing electric field. A held metal object next to a grounded pipe can then spark across the micro-gap. In the near field this is called capacitive induction; farther out it is radiation. The two are one field described at different distances. 3. Grounding one terminal gives the large conductor on the other terminal a return path through the earth (here, the building's gas and water mains), so the whole building's metalwork takes part.

This was accepted physics by 1890 and is how Hertz made his first radio waves. Hertz used an induction coil to spark a gap in a capacitance-loaded dipole of two 1 m wires with 30 cm zinc spheres, about 30 kV, about 50 MHz [web] https://en.wikipedia.org/wiki/Heinrich_Hertz (1886-88; the Wikipedia text gives about 30 kilovolts and about 50 MHz). The tin stills on glass jars in Houston's third experiment are the same idea as Hertz's spheres.

Worked numerical example (my arithmetic; assumptions marked; the sources give no primary current, inductance or voltage)

Spark length to voltage: a table in Wikipedia's "Induction coil" article gives 4 in = 110 kV, 8 in = 150 kV, 12 in = 190 kV, 16 in = 230 kV (from Schall, Electro-medical Instruments, 1914) [web] https://en.wikipedia.org/wiki/Induction_coil , about 10 kV per inch above 4 in. By that table: - Houston's coil, 6 in free-air spark: about 125 kV. - Morton's coil, 21 in: about 280 kV (extrapolated; Wikipedia states the relation is linear "within a wide range"). App's 29 in: about 360 kV.

Capacitance of the conductors in Houston's experiments (isolated sphere with the same surface area, order of magnitude only; C = 4 pi eps0 sqrt(A / 4 pi)): - Under 1 sq ft (0.093 m^2): 9.6 pF (pF = 1e-12 F). - A table surface of about 3 m^2 (assumed; Houston gives no size): about 54 pF. - "Several hundred" sq ft, say 300 sq ft (27.9 m^2): about 166 pF. - Wahl's Leyden jar, 1 1/3 sq ft = 0.12 m^2 of glass about 3 mm thick, relative permittivity about 6 [memory, medium]: C = eps0 er A / d = about 2 nF. That is about 200 times Houston's under-1 sq ft conductor.

Energy-limited spark. Suppose, as an assumption, the primary delivers E0 = 0.125 J per break to the secondary (for example L_p = 10 mH, I = 5 A; not from the source). The charge and voltage reached on capacitance C are V = sqrt(2 E0 / C) and Q = sqrt(2 E0 C), limited by V_b = 125 kV (6 in): - C = 10 pF: V would be 158 kV, above 125 kV, so the gap breaks first at 125 kV with energy (1/2) C V_b^2 = 0.08 J. Long 6 in spark, little charge (Q = 1.25 uC). - C = 16 pF is the "knee": V = 125 kV, all 0.125 J spent in a 6 in spark. - C = 30 pF: V = 91 kV (about 3.5 in), Q = 2.7 uC. - C = 100 pF: V = 50 kV (about 1 in or less), Q = 5 uC. - C = 170 pF: V = 38 kV, Q = 6.5 uC.

Reading the table against Houston: the spark gets shorter, thicker (more charge) and whiter as C grows. Above the knee the energy per spark stays at E0, so the eye-judged "quantity" (brightness, loudness) stays about level while length drops. Below the knee the capacitance can no longer hold the energy and the spark is length-limited. Houston's fourth experiment (one conductor under 1 sq ft, other larger, "a fine quantity spark of about five inches") sits at exactly this knee: two conductors on the two poles act in series, whose capacitance is dominated by the smaller one (about 10 pF for 1 sq ft), so the series capacitance, about 10 pF, is near the knee of about 16 pF, giving a long spark (5 in) with nearly the full energy. The model therefore reproduces, in order of magnitude, the shape of every statement in the note, using only assumed numbers. It does not prove them; the knee location depends on E0, which is unknown.

Cascade check against Morton 1867: n jars in series have capacitance C/n, so at fixed energy V rises as sqrt(n). Six jars in cascade should give about 2.4 times the voltage of one. Morton measured 1 in (one jar) and 4 in (six): a factor 4 in length. Spark length does not rise linearly with voltage at short gaps (the Wikipedia table has an offset), so the direction and size are right, the exact ratio is not predicted.

Ringing frequency. With a lead loop of L_loop = 1 to 10 uH (a few metres of wire; assumed) and C = 30 to 100 pF: f = 5 to 29 MHz, wavelength 10 to 60 m. At 10 MHz the near-field zone, lambda / 2 pi, is about 4.8 m. Houston's sparks at 8 to 9 ft (2.4 to 2.7 m) are in the near zone, where the electric field is mostly quasi-static (capacitive induction), which is what he called induction. The steam engine at 30 ft (9 m) and the rooms below and adjoining are around the transition to the radiation zone and are also driven through the building's pipes and the stove, which behave as conductors tied to the earth wire. So his 1876 statement, that the sparks are "induced currents", and Susskind's and Woodbury's statement, that radiation was occurring, are not in conflict on the physics: both describe the same field at different ranges. What is not shown by any 1871 experiment is a propagating wave; that needed Hertz's standing-wave and reflection measurements (1888) [web] Wikipedia Hertz, same URL.

Energy accounting for the "radiant energy" reading. The energy in the sparks drawn at a distance is small: a person's finger and a pipe are perhaps 50 to 100 pF; at a few kV the spark energy is (1/2) C V^2 = 0.1 to 1 mJ, against hundreds of millijoules per break from the coil (assumed above). The note reports no input and output power, no measurement of anything exceeding the battery's input, and no claim of extra energy. The "shock at every break" (p.595) is explained by a person's body capacitance coupling to the secondary's 100 kV terminal and the primary's break voltage reaching the break-piece handle. The forum readings, "radiant energy", "scalar wave transmitter", "radiant shock wave", are the posters' characterizations [read: Energetic Forum notes in research/2026-10-08-energeticforum.md]; the source does not say these things, and the standard account does not need them.

Evidence record of the 1871 note (what was seen and not seen)

Seen [read: pp.594-596]: thicker, shorter, "silvery white" spark; long sparks from the table or any metal "within eight or nine feet"; gas lit by a spark from a person's finger; sparks from a distant stove and a small steam engine "fully thirty feet" away; sparks in a room below "from a wire which connected with the table"; a slight shock at each break; with tin stills and percolators on glass jars, "quantity of the spark increased"; two conductors, "a fine quantity spark of about five inches". Not given: date, battery, primary current, break rate, areas (except the end point), spark lengths after the first arrangement, trial counts, witnesses, any instrument reading, any control (the baseline is the coil's rated 6 in, not a measurement beside the trials). A single observer; the same coil was used throughout. The note has no mention of Morton, Thomson or Wahl.

Claims

Claim 1. One secondary pole to earth (gas pipe), the other on a large imperfectly insulated conductor (table): spark thicker, shorter, silvery white; long sparks drawable from metal 8 to 9 ft away.

a. Mathematics: none stated. My capacitor-loaded spark-gap model reproduces the signs of all three changes. Internally consistent: the coil is a 6 in coil, the poles are held under 6 in apart ("no danger of injuring the instrument", p.595) so the spark goes across the gap and not through the insulation; this is a sensible stated precaution, not a contradiction. b. Established experiments: capacitors in the discharge path shorten and brighten sparks (Morton 1867, j.256; Plucker's spectra as cited there; textbook spark-gap theory). Radio-frequency pickup by nearby metal from a coil's spark gap: Hertz 1887-88 [web] Wikipedia Hertz. Also Edison's "etheric force" sparks, reproduced by others, now understood as radio [web] https://en.wikipedia.org/wiki/Etheric_force ("a phenomenon later understood as high frequency electromagnetic waves", signals sent "twenty to thirty feet"). c. Tested: observed by Houston alone in 1871. Repeated by Houston and Thomson in December 1875 with a ten-cell battery and an insulated conductor, same effects reported [read: Houston 1876, j.60]; their account is by the original author (a party with a priority interest in 1876, as its editor's note shows). Independent confirmation of the family of effects: Edison, Beard (1875-76), S. P. Thompson (showed the received sparks were oscillatory, 1875-76), Hughes (1879), Dolbear (1882) [read: Atherton 1984, as summarised above; secondary source], and Hertz (1887-88) [web]. No one has repeated the exact 1871 arrangement under measurement, and nothing has been measured. d. If true, what would change: nothing. It is already inside mainstream physics. For the "radiant energy" reading (energy beyond the input), it would require violating energy conservation; nothing in the source asserts that. Verdict: Established (the qualitative effect: capacitive loading with an earth return, and sparking from nearby grounded metal). Never properly tested (any quantitative statement: no measurement of length, charge or energy exists, and the 1871 note gives none). It was not dismissed; it was simply never measured.

Claim 2. With the other pole on a stove system, sparks were drawn from a distant stove and a small steam engine 30 ft away, and from a wire in a room below.

a. No mathematics. Internally, the engine is "fully thirty feet" away but the electrical path to it is not described. Houston's 1876 note says the engine was "in metallic connection with the water-pipes" and the pneumatic trough "by soldered joints" [read: Houston 1876, j.59]. So the engine was a grounded, extended conductor, which fits the physics above (pipework and engine as part of the circuit's earth return and as antennas). b. Consistent with Hertz-type pickup and with Edison's sparks at "twenty to thirty feet" [web] Etheric force page. The distance from a 1 to 30 MHz ring through a building's metal pipes is unremarkable. c. Tested: single 1871 observation, repeated qualitatively in 1875 (December 1875 with Thomson, same rooms) [read: Houston 1876, j.60]. Woodbury (1944) adds that Thomson, in 1875, drew sparks five floors up, "90 feet" above the coil, in the observatory, and that Professor Monroe B. Snyder drew them too and said "Electric energy transmitted through space!" [read: Woodbury 1944, book pp.63-67]. This is one published source, a 1944 Thomson-side biography written 69 years later, with no contemporary note found; I weigh it as a plausible report, not a measurement. A grounded pipe riser through five floors would carry the signal. Mainstream radio practice agrees that tens of metres at megahertz frequencies through a building of metal pipes is easy. d. Nothing changes in mainstream physics. Verdict: Established (that sparks are drawable at these distances: confirmed by later work including Edison's and Hertz's). The path to the engine and the stove is undescribed in 1871, so the claim as written is also Not testable as stated in detail; the 1876 note fills it in.

Claim 3. A large insulated conductor (tin stills on glass jars) on one pole, or a separate conductor on each pole, raises "quantity". Shrinking one conductor below about 1 sq ft restores a spark of about 5 in "without sensible diminution in quantity" from a 6 in coil.

a. Consistent as shown in the worked example: the series capacitance of two conductors is set by the smaller one, so shrinking one raises the maximum voltage and restores length; the energy stays about constant until the capacitance falls below about 16 pF (my assumed E0), about 1 sq ft of conductor. The statement "5 in at under 1 sq ft" is in the right place on this model. "Quantity" in 1871 was judged by eye; in modern terms it is energy per spark (or charge), which my model says stays level then falls, so "without sensible diminution" is plausible for an eye test but could not hold for charge Q = CV measured instrumentally (it falls with C below the knee). b. Consistent with Morton 1867 (cascade jars) and Wahl 1871 (coupling for quantity shortens the spark) and with textbook Leyden-jar behaviour. c. Tested only by Houston by eye, once, 1871; nothing in 1875-76 repeats the two-conductor step. No instrument. d. No change to physics. Verdict: Established as a qualitative trade-off (it is the same capacitance-versus-spark-length trade-off Morton published in 1867). The specific "5 in, no loss of quantity" figure: Never properly tested (eye judgement; no photometer, no charge or energy measurement).

Claim 4. Houston's explanation (the large conductor allows rapid discharge of the secondary and so rapid induction in it, as when a frictional machine's conductor is earthed), and his untested proposal of one pole on an insulated conductor of several hundred square feet and the other earthed.

a. The words "rapid induction of electricity in the secondary wire by its rapid discharge" (j.419) are not a derivation and are loose by modern standards: in the secondary, induction is by the changing primary flux, not by the discharge. What the added capacitance really does is store the energy as charge and release it in one high-current burst (my model). The frictional-machine analogy (earthing one conductor, "generally the negative", increases "the quantity") is sound in substance: a one-sided source has nowhere to dump charge without a return, and earthing gives it one. In 1876 Houston restates it as "condensation of the spark by connection with extended surfaces, similar to ... a Leyden battery" [read: Houston 1876, j.58-59], which is the correct capacitor description; so the 1876 wording corrects the 1871 wording. His later explanation (instantaneous outgoing current followed by an inverse current, "direct and inverse currents", extra current) is right in kind: a damped oscillation of the electrical system. The "maximum" proposal: in the energy-limited model Q = sqrt(2 E0 C) keeps rising with C but V = sqrt(2 E0 / C) falls, and at C = 170 pF (300 sq ft) the spark is already below about 1 in. The energy per spark cannot exceed E0 whatever C is, so "maximum increase in quantity" is a maximum of charge at the cost of length, not of energy. Practical limit: leakage to earth and insulation of a conductor that large. The proposal is therefore plausible as a statement about charge, not testable as a statement about "quantity" without a definition. b. The 1876 tests are consistent with established results: no electroscope deflection, no galvanometer deflection, no cotton-wool attraction, retro-action seen; with an oscillating, zero-average current these are the expected readings (a time-averaged field of an oscillation of megahertz frequency does not deflect a gold-leaf electroscope or a slow galvanometer). The April 1876 balanced-battery experiment (two halves of the battery equal and opposite, sparks vanish; any extra metal or the finger restores them) is a clean demonstration that the sparks depend on the stray capacitance and its symmetry [read: Houston and Thomson 1876, j.272-273]. This is their strongest experiment and is against Edison's "new force". c. Tested: the explanation by Houston and Thomson in 1876 (their own experiments); not independently replicated by anyone I could find in the folder or the Investigator's record. S. P. Thompson and Hertz supplied the oscillatory view later [read: Atherton; web Hertz]. The "several hundred sq ft" step was never tested in 1871; in 1875 "a large insulated conductor" was used with no area given. d. Nothing would need to change. The explanation is a loose, partial early statement of capacitive loading and oscillatory discharge. If one took Susskind's and Woodbury's reading (waves in 1871, Maxwell proved), nothing in mainstream theory changes either: Maxwell's waves were predicted in 1864; what changes is the history of who first saw their effects. Verdict: split. The capacitive-loading content: Established (in modern form). The wording "rapid induction by rapid discharge": Historically superseded but instructive. The "several hundred square feet gives the maximum" proposal: Plausible, untested (and, as an energy statement, mistaken: a bigger conductor gives more charge, shorter spark, same energy).

Claim 5. Ritchie's coil for Morton (44 1/3 miles of secondary wire, about 250 lb) gives 21 in sparks from three bichromate cells, more reliably than a larger London coil (29 in, about sixty cells, failed). (Wahl; claim 5 in claims.md says "443 miles", corrected above.)

a. Numbers checked: wire length 234,100 ft = 44.3 miles; weight 44 lb (bare copper 34.7 lb); the coil's total weight 250 lb and packed 355 lb are consistent with it. Resistance of the secondary: rho L / A, copper rho = 1.7e-8 ohm m [memory, high]; L = 71.35 km; A = 2.48e-8 m^2; R = about 49 kOhm. Not internally inconsistent after the correction. Plausible bounds: the 21 in is about 280 kV (Wikipedia table extrapolated); the insulation was "proved by actual experiment to be 50 per cent greater than a spark of 21 inches would penetrate" (p.321). Glass 3 in thick (76 mm) pierced by a spark that matches 21 in of air (53 cm): this gives about 3.7 kV/mm for the glass (280 kV / 76 mm), well below the 10 kV/mm and up commonly quoted for thin glass [memory, medium], plausible for a thick block with a concentrated-field spark. Not a prediction I can check closely. b. Consistent with other large coils of the time: Ruhmkorff coils with 5 to 6 miles gave 16 in; Spottiswoode's Apps coil 280 miles gave 42 in with 30 quart-size liquid cells [web] Wikipedia Induction coil. Three bichromate jars are about 6 V (assumed, [memory, medium]); the primary is 200 ft of 0.1655 in wire, whose resistance is about 0.08 ohm (assumed copper; my calculation); a large-plate cell can deliver tens of amperes, which with the iron core stores joules at break. Plausible, no contradiction. c. Tested: by the owner's lectures in Baltimore and Washington (Morton, reported through Wahl) and Ritchie's guarantee; Wahl is a co-editor describing the other editor's instrument (an interested party in a loose sense, as the project's facts note). No independent test is on record. No surviving instrument or museum record was found by the Investigator (one query). Wahl's promised "further account" of experiments did not appear in the volume or in JFI to June 1872, per the Investigator (see Absence of evidence below). Brenni (2015) is a modern historian who has a figure of the coil [web] https://www.academia.edu/13825373/Very_large_induction_coils ; text not read. d. Nothing would change in physics. Verdict: Plausible, untested (no independent test on record; consistent with the technology of the time).

Claim 6. With a Leyden jar or Morton's secondary condenser in circuit the coil gives short, white, loud sparks (about 2 3/4 in with a 1 1/3 sq ft jar; 14 in with a 20-pane condenser); coupling its halves "for quantity" shortens the spark to 12 in.

a. Jar, corrected: 1 1/3 sq ft (about 2 nF); 21 in spark shortens to about 2 3/4 in, i.e. voltage falls from about 280 kV to about 100 kV (Wikipedia table, 2 3/4 in is below the table's 4 in = 110 kV, so roughly 90 kV or less). Stored energy at 90 kV on 2 nF is (1/2)(2e-9)(9e4)^2 = about 8 J; I cannot say whether the coil delivers 8 J per break from three cells; the primary energy is not given, so this is a plausibility check only. The 20-pane condenser: panes in series (Morton's design, as in the 1867 paper: adjacent coatings connected) so capacitance is the single-pane value divided by 20; the capacitance is therefore much smaller than a single jar and the spark is longer: 14 in. The direction and the order of the ratio follow the sqrt(n) rule shown above. Pane sizes are not given in Wahl, so I cannot do the number properly. Coupling the two halves "for quantity": I assume this means the halves of the secondary are put in parallel, not series. Parallel halves give the voltage of one half, with twice the current capability, about half the voltage, and the spark should shorten a lot. The 21 in to 12 in drop is a smaller drop than the simple halving would predict (about 6 in on the Wikipedia table), but the table is only linear and approximate, and what Ritchie's "coupled for quantity" means is not stated. Direction right, magnitude not checkable. b. Consistent with Morton 1867 (jar shortens, brightens; cascade of jars lengthens) and with Plucker's spectra as cited there. c. Tested by Morton and Wahl; the jar and cascade results were published first in 1867 and could be repeated with any coil; Morton 1867 cites Professors Rogers and Frazer of Philadelphia as having used a jar before him. Replicated by others in the sense that jar-in-circuit is textbook; the particular 14 in and 12 in figures are single reports by an interested party. d. No change. Verdict: Established (jar or condenser shortens, whitens and loudens the spark; the trade-off between length and "quantity"). Plausible, untested (the specific 14 in and 12 in figures, and what "coupled for quantity" does).

The Investigator's findings, weighed (kept whatever my verdict)

1. Houston, "Phenomena of Induction" (JFI Jan 1876). Read in full. It is the best evidence on his mechanism and on what he saw: more distant sparks (trough, engine, boiler, gas pipes with a knife blade), the 1875 repetition with battery stated, the four tests (electroscope, galvanometer, cotton wool, retro-action), the demonstration that an interrupted electromagnet alone produces the sparks. Physics: all in accord with oscillatory capacitive coupling (above). His claim that "all the effects noticed ... are readily explainable by the presence of an instantaneous outgoing current, immediately followed by an incoming one" is correct in kind; the figure "some hundred thousand miles per second" for electrical currents is rough (about 186,000 miles/s = c for waves in free space, slower in wires) [memory, high]. Stake: Houston's priority; the Journal's editors add the priority note ("whatever there may be remarkable ... was described by Prof. Houston, previous to the discovery of Mr. Edison") [read: per Investigator's lead]. The "no discoverer's credit" claim against Edison is an interested party's, and I judge it fair on the facts: the 1871 sparks and Edison's are of one family, but Houston did not call them anything new, and Edison also saw no polarity because of averaging.
2. Houston and Thomson, "The Alleged Etheric Force" (April 1876). Read. The balanced-battery and paired-magnet experiments show the effect depends on the symmetry of the stray capacitances; they are good controlled tests by 1876 standards, run by the authors for the purpose of showing it is ordinary induction. Their own explanation treats the wire and core as a Leyden jar's two coatings; correct in kind. Their conclusion "no new force" is right by today's physics; they did not recognise the radiation (Maxwell's theory was not generally accepted in 1876).
3. Morton 1867. Read (see Correction 5). This is prior art for claims 3 and 6.
4. Scientific American 10 June 1871 reprint. Read the relevant lines; the text matches the Journal note ("silvery white", "fully thirty feet"). It shows wide circulation, with no new facts.
5. Authorship dispute (Woodbury says Thomson did the 1871 observations and Houston "took sole credit"). A Thomson-side biography from 1944; Houston's note names no assistant. Differences in detail: Woodbury says Leyden jars were first used across the gap and "turned them a vivid blue", Houston says "silvery white", and Woodbury puts "water pipe and metallic table top as condenser plates" whereas Houston says gas pipe and table; Woodbury is clearly a narrative reconstruction (Maxwell's waves were "the practical apparatus", etc.). I do not decide authorship; physics does not depend on it. The record that would decide: Thomson's notebooks and letters at the American Philosophical Society (Mss.Ms.Coll.74). I have not read them.
6. Radiated-wave reading (Susskind 1964, Atherton 1984, Woodbury 1944): physically sound as to what the field is (the ringing spark gap radiates) and consistent with Hertz's work; these are the historians' reading, and Houston's own explanation was induction. See Correction 3 on Atherton's "30 m".
7. Free-energy or "radiant energy" readings (Kelly, Energetic Forum thread): the physics is the same capacitive-loaded spark gap; nothing in Houston or Wahl claims excess energy. The forum thread's mechanism ("resonance with water pipe", "tabletop was antenna", "frequency probably not more than 5 kHz") is the posters' guess. My estimate (about 5 to 30 MHz) differs; neither is measured. No measurement of the 1871 frequency exists. These readings are kept in the record as the alternative-energy community's characterization.
8. Edison's etheric force. Related work in the same family; mainstream: "a phenomenon later understood as high frequency electromagnetic waves" [web] https://en.wikipedia.org/wiki/Etheric_force ; Edison's own call was a new force. Western Union's financial pressure ended his work (same page; per Wikipedia, not verified elsewhere).
9. Absence of evidence. No JFI follow-up to Wahl's promised account of experiments with the Morton coil appears in July 1871 to June 1872, and no further Houston note until December 1875 (Investigator). My physical reading of the competing explanations: (a) the work was done but not written up (editorial workload; Morton's move to the Stevens Institute presidency in 1870); (b) it was published elsewhere (American Journal of Science, Stevens records; not searched); (c) it was not done. Physics cannot choose among them. The deciding record is Morton's papers at the Stevens Institute and JFI 1872 onward. Houston left for Germany in 1872-73 and Wahl taught in his place, per Edmonds 1902 [read, as quoted by the Investigator]; that lowers the chance of a follow-up by Houston in that year.
10. Not found: no replication of the 1871 arrangement under measurement by a third party before Hertz, and no surviving Ritchie-Morton coil record.

Summary of verdicts

Overall: the physics holds. Nothing in the two articles conflicts with mainstream physics; the observations are an early, qualitative record of capacitively loaded spark-gap behaviour and of the radio-frequency pickup that Hertz explained in 1887-88. The note's lasting interest is historical (stray sparks that Edison, Houston and Thomson fought over in 1875-76, and that Susskind and Atherton call pre-Hertz observations of electromagnetic radiation), and its limits are that nothing was measured. Nobody who reads the sources fairly finds a claim of excess energy.