Electrical and scientific instruments and apparatus : november 20th, 1899 (1899)
Elmer G. Willyoung & Co · New York : E.G. Willyoung · leaf 68
ighest possible limit. W4890. Kelvins Electrometer Key 22 50 W4391. Damping Coil and Checking Key 30 00 This is a very useful device for bringing galvanometer systems, par-ticularly those of ballistic instruments, quickly to rest. Consists of asmall coil (free of magnetic material) so mounted upon… … KEYS WITH RUBBING CONTACTS. W4392. Short Circuit Key Grade B |17 50 On high insulation rubber pillars. W4393. Improved Reversing Key Grade B $40 00 W4394. Muirheads Reversing Key Grade B $50 00 (See Kempe, p. 286.)W4396. Rymer-Jones Diseliarge and Reversing Key Grade B |40 00 (See Kempe, p. 286.)…
Electric apparatus and appliances · Equipment and supplies
Internet Archive · Medical Heritage Library · Public Domain Mark 1.0. Free to use for anything.
