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 77
In the arrangement of ratio coils,errors due to plug contacts are negligible because only two plug contacts enter the circuit,and with an even ratio, it is only the difference in the resistances of the two plug contactsthat can affect the result. In measuring any of the ratio coils while in the… … Figs. 573 and 574.—The Leeds andNorthrup decade. The object ofthis arrangement is to reduce thenumber of coils required. In fig.573, the 1, 3, 3 and 2 are con-nected in series. Let the ter-minals of the 1 ohm and 2 ohmcoils be numbered (1), (2), (3), (4) and (5) (fig. 573). The cur-rent enters at…
Electrical engineering
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