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 535
Fig. 79. Browns Rail-bond Testing Instrument.Street Railway motor Vesting*. Barn test for efficiency : — Put a double-flange pulley on tbe car axle for tbe application of a pronybrake, pour water inside tbe pulley to keep it cool. Use common platformscale, as shown in cut. … Fig. 80. Then let D — distance from center of axle to point on scales in feet,measured horizontally.7T = 3.1416, R = revolutions per minute,E = voltage at motor,1= amperes at motor,T— force applied to balance scales, in pounds. B. H. P. at 500 volts =EI .P. (2 7! 2tt DR T 33,000500DR XE )T 746500 I…
Electrical engineering
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