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 262
Fig. 37. Fig. 38. pilot brush, a, in the first cut, or the two brushes, a and b, in the second cut,is started at the brush x, and moving a distance of one segment at a time,the difference in volts between the brush x and the location of the pilotbrush, a, is read on the voltmeter. Where the one…
Electrical engineering
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