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 297
ermanentmagnets as to render the meter inaccurate. 1,816 HAWKIXS ELECTRICITY Ques. What precautions are taken to keep the strengthof the permanent magnets constant? Ans. Weakening with age is prevented by the process ofAging. The effect of neighboring fields is overcome by ironshields; this… … FlG. 2.549.—Register dial of Sangamo single phase induction watt hour meter (full size). Thedial circles read 10, 100, 1,000, and 10,000 kilowatt hours from right to left. required reduction in speed. This gear train is driven directlyby the rotor and therefore its friction should be low and…
Electrical engineering
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