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 110
total length of the bad wire MX was 1.44 miles. Required, the distanceto the break. Substituting the values in the formula: d = 180 X 88 X 1.44 1,000 (180 - SS> + ISO X 88 = .211 + mile. TESTING AND TESTING APPARATUS 529 To Pick Out Faulty Wires in a Cable.—Short circuit thecoils E and R with… … Fig. 613.—Diagram of the Crompton potentiometer. In this instrument the resistance con-sists of fourteen coils, each of 10 ohms, in series with a straight wire, also 10 ohms resistance,thus forming a system of fifteen equal steps. Across the whole a pressure of 1.5 volt isapplied from a secondary…
Electrical engineering
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