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), 1833-1928 · New York : T. Audel & Co. · leaf 110
cott Joule, worked for more than fortyyears in establishing the relation between heat and mechanicalwork; he stated the doctrine of the conservation of energy and 90 HAWKINS ELECTRICITY discovered the law, known as Joules law, for determining therelation between the heat, current pressure, and time… … Fig. 86. —Joules experiment on the mechanical equivalent of heat, in which he caused paddle-wheels to rotate in a vessel of water by means of falling weights W. The amount of workdone by gravity upon the weights in causing them to descend through any distance d wasequal to their weight W times the…
Electrical engineering
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