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 335
Fig. 12. … PRONY BRAKE Fig. 13. Probably the most common method of testing the efficiency and capa-city of motors is with the prony brake, although in factories where sparedynamos are to be had, with load available for them, there can be noquestion that belting the motor to the dynamo with an electrical load…
Electrical engineering
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