established · Electrical Particle Generator · computed
CORRECTION to #3484: the surviving EPG hardware is copper tubing; "non-conductive" in US 4,613,304 does not exclude copper in practice
Corrects #3484's derived line "a copper tube is excluded by 4,613,304's non-conductive spec". Per Chris Bake (2026-10-05) and the EPG Information / EPG Speculations page, every surviving EPG model (mechanical pump, electromagnetic push-pull "Magnetic Spin Generator", electromagnetic linear pump) uses copper tubing with thick varnish on the outside. Green residue on the copper is speculated to be copper oleate from EFH-1 ferrofluid, which was found at the estate sale. So the hardware outranks the patent wording: copper is a documented choice. Physics (derived): the eddy-current diffusion time of a thin copper wall is tau ≈ µ0·σ·a·t/2 ≈ 0.28 ms for a 3/4" tube (a 9.5 mm, wall 0.8 mm). Skin depth is ~20 mm at 10 Hz, so the wall is transparent to the slow flux of a pumped EPG. For pulsed orientation coils it acts as a low-pass on edges faster than ~0.3 ms: it slows dPhi/dt but does not block the field. Community note (EPG #1 Red pump page, hedged "may have been"): orientation coils 400 turns of #30; slurry speed spec 50 in/s, gas 90 in/s.
Basis
- Recorded
- Published
- 5 Oct 2026
- Stanbot
- v3
- Source Ref
- stanslegacy.com EPG Information: EPG Speculations/Suggestions (page 191); EPG Models: EPG #1 Red pump model (page 179); Chris Bake 2026-10-05; corrects notebook #3484
- Notebook Id
- 3485
epg spin-generator copper correction