Chrome: "Permission denied for reading page content on this domain" (extension site permission). That counts as a Chrome failure, so WebFetch was used as the fallback for the listing and two PDFs.
Silvertooth files: Silvertooth1.jpg, Silvertooth2.jpg, Silvertooth3.pdf (723 KB), Silvertooth4.pdf (938 KB), Silvertooth5.pdf (237 KB). Also WW1978-Oct-p44-45.pdf (probably L. Essen, Wireless World Oct 1978 p.44, cited in the 1989 article), Dingle-ScienceAtTheCrossroads.pdf and GPS.pdf.
Silvertooth4.pdf, from a Google snippet: R. G. Newburgh, "Relativistic phase invariance: comments on a recent effort to reinvoke the ether", Appl. Opt. 1977, U.S. Air Force RADC/Deputy for Electronic Technology, Hanscom AFB. Not read this run.
Saved (WebFetch cache, copied to research/files/):
Silvertooth3.pdf = Applied Optics 15(5), May 1976, pp. 1100-1102: Silvertooth, "Electromagnetic radiation, relativity, and anomalous red-shifts". File: files/Silvertooth-1976-AppliedOptics-15-1100-anomalous-redshifts.pdf
1976 paper, key content [web: page images p.1101-1102 of the saved PDF]
Author address: 974 Flintridge Avenue, Pasadena. Received 23 May 1975. Sponsored (OSA Letter endorsement) by John Strong, University of Massachusetts.
Argument: accept the Lorentz transforms. The Sagnac phase along a segment L is δ = L·v/(cλ), independent of r. He argues the two postulates are then mutually inconsistent if δ is observable. Plotted against path curvature, relativity would need a discontinuity at zero curvature, "a physical impossibility". This is the same Sagnac step as the 1986 paper (assumption A3 in the deep read), 10 years earlier.
He quotes Simon Newcomb's 1881 letter to Michelson (National Archives RG78): motion "makes itself felt by a difference in the wavelength and velocities of propagation in different directions," which a round trip cancels. This is a historical precedent for Silvertooth's principle.
Earlier experiment with a NULL result: two free-running single-mode lasers in opposite directions; two 500 Å semitransparent photocathode detectors 50 cm apart; granite block on an overhead air bearing. For Δv/c = 1e-4 he expected 79 cycles on a 90-degree rotation. "No phase shift was observed." He read this as showing that the relative phase is invariant with v. He concluded the Sagnac shift comes from a change in frequency and velocity, with the wavelength change a result.
He proposes an E-W two-oscillator phase test. With L = 2 m and v_max = 3e6 cm/s at ν = 8.85e13 Hz, he predicts a 59-cycle peak-to-peak diurnal variation. "Execution of an experiment along these general lines is presently under way at the University of Arizona Optical Sciences Center" (ref: Third-Quarter FY75 Applied Optics Research Report, OSC, May 1975).
Origin of 1986 eq. (10): if v changes with time, δ̇ = L·v̇/(cλ), a frequency shift. This gives ν_o = (ν_s/γ)(1 ± v_r/c)(1 ± L·v̇_r/c²), where v̇_r is the radial acceleration of the source. Quasar case: in a rotating galaxy, a quasar at distance d from the centre along the line of sight has v̇_r = d·ω². So the bar in the 1986 retyping's "v̄" is most probably a dot (time derivative). The term L·v̇/c² is then dimensionless, which resolves the deep read's units question. That is an inference from the 1976 text and needs the Mathematician's check.
Hypotheses (1)-(6), including "(4) Absolute velocity can be measured" and "(5) ... absolute acceleration may be measured independent of ... a gravitational field".
Acknowledgements: Tube Department, General Electric Co., Syracuse (special detectors); Gordon Orme; John Strong.
Replies in Applied Optics 16(3), 1977: Øyvind Grøn, "On Silvertooth's discussion of special relativity" (p.543), and Silvertooth's "author's reply to comments" (p.543-544) [web: Optica search]. Not read.
1983 paper [web: saved PDF]
Silvertooth (Pasadena) and S. F. Jacobs (University of Arizona Optical Sciences Center). Received 13 January 1983. The detector is described as a photoelectric analogue of Wiener's 1890 photographic standing-wave experiment. The node/antinode ratio measured was about 20,000:1, giving an effective photosensitive thickness < λ/100. Photomultiplier made from image-orthicon parts at GE Syracuse. Thanks "Bob Shannon" (Robert Shannon, OSC director; identification is [memory, medium]).
Bearing
Claim 5: the derivation and meaning of eq. (10), and the quasar mechanism, are in the 1976 paper.
Claims 1-2: the same principle published in 1976 with a mainstream-journal reply (Grøn, Newburgh).
Claim 4: a NULL result in the earlier two-laser experiment (1975-76) is pertinent and stays in the record. It also documents the University of Arizona connection (Jacobs, OSC report FY75).