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 65
andrequires only a voltmeter, battery, known resistance and a twoway switch. The instruments arc connected as in fig. 558, and in making thetest, the voltmeter is switched into circuit across the known 484 HAWKINS ELECTRICITY resistance and then across the unknown resistance, readings beingtaken in… … Fig. 559.—Leeds and Northrup portable galvanometer (pointer type A). The sensitiveness ofthis instrument is such that it may be substituted in numerous cases for the non-portablereflecting type of galvanometer; as for instance, in the checking of ammeters and volt-meters to an accuracy of .2% by…
Electrical engineering
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