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 152
the series coil and the permanent magnets is a heavy soft iron shield to guard themagnets against disturbance by short circuiting. Light load adjustment is obtained bypro\nding in the coil circuit a series of small resistance spools, equipped with pin terminals,to which connection can be… … C0MPEW5MIN&COIL SWITCH Fig. 663.—Diagram showing internal connections of the Duncan watt hour meter. Its opera-tion depends upon the principle of the well known electro-dynamometer, in which theelectromagnetic action between the currents in the field coils and an armature pro-duces motion in…
Electrical engineering
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