Hawkins electrical guide. Questions, answers & illustrations; a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833- · New York, T. Audel · leaf 272
Pics. 2.508 to 2.511.—Hoskins instruments.Fig. 2,508. voltmeter,small pattern; fig.2,509, ammeter, largepattern; fig. 2.510.voltmeter, horizontaledgewise pattern; fig.2.511, illuminateddial voltmeter. INDICATING DEVICES 1,791 Ques. Describe the rotary field type of inductioninstrument. Ans. The… … Fig. 2,512.—Hoskins instrument with case removed. It has a very short magnetic circuitwhich is composed of silicon steel, permitting low magnetic densities to be used. Dynamometers.—This type of instrument is used to measurevolts, amperes, or watts, and its operation depends on thereaction between…
Electrical engineering
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