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 131
passes through it. The current 550 //.4irA/.V5 ELECTRICITY flows only in the portion of the wire marked A, between the plateE and the pulley B up to the point K where the connection isshown. When a cturent flows through the wire A, the springtakes up the slack, pulls A around B, and causes B to… … Fig. 638.—piagram showing principle and construction of the Whitney hot wire instruments.The action of instruments of this type depends on the heating of a wire by the passage ota current causing the wire to lengthen. This elongation is magnified by suitable mechan-ism and transmitted to the…
Electrical engineering
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