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 60
flections are obtained. When this obtains, the resistance in the box is the same asthe resistance being tested. Oues. What kind of adjustable resistance is used inmaking the above test?Ans. A resistance box. TESTING AND TESTING APPARATUS 479 Oues. Describe a resistance box. Ans. It consists of a… … Figs. 554.—Ordinary resistance box. It contains sets of standard resistances consisting ofcoils ot insulated wire having low conductivity and small temperature coefficient. Theends of the coils are joined to the section of the bar between the plugs. The insertion ofa plug cuts out a coil. In using,…
Electrical engineering
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