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 137
Fig. C40.—Diagram of Siemens electro-dynamometer. It consists of two coils on a commonaxis, but set in planes at right angles to each other in such a way that a torque is producedbetween the two coils which measures the product of their currents. This torque is balancedby twisting a spiral spring…
Electrical engineering
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