Electrical engineer's pocket-book: a hand-book of useful data for electricians and electrical engineers (1901)
Foster, Horatio A. (Horatio Alvah), 1858-1913 · New York, D. Van Nostrand co.; London, E.& F.N. Spon, ltd. · leaf 41
Fig. 19. 28 SYMBOLS, UNITS, INSTRUMENTS. … Another arm is left open for the unknown resistance, x, which is to be measured. The remaining two arms each have three resistance coils of 10, 100, and 1000 ohms respec-tively. Two keys are sup-plied with the P.O. bridge,one for closing the bat-tery circuit, and the otherfor closing the…
Electrical engineering
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