International Library of Technology · Scranton, International Textbook Co. · leaf 253
Fig. 1035. 2548. For many electrical measurements, it is neces-sary to know the rate of revolution of certain moving parts ELECTRICAL MEASUREMENTS. 1687 … Fig. 1036. of machinery. The numberof revolutions made by themachinery in one minute orother length of time does notnecessarily give its rate ofrevolution, so that for ac-curate work the ordinaryrevolution counter is scarcelysuitable. Instruments calledtachometers are madewhich indicate by the…
Electrical engineering
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