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 334
one of two similar dynamos as amotor, and belt the second dynamo to it. Put the proper load on the dy-namo, and the efficiency of the combination is the ratio of the watts takenout of the dynamo to the watts supplied to the motor. The efficiency ofeither machine, neglecting small differences, is… … Fig. 11. Diagram of connectionsfor Hopkinsons test of two sim-ilar dynamos. The above test is especially applicable to rotary converters, the belt beingdiscarded, and the a c sides being connected by wires ; thus the first ma-chine supplies alternating current to the second, which acts as a motor…
Electrical engineering
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