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 400
RICITY The following empirical formula gives the energy required in wattsr heating rooms: watts = B. t. u. per hour = 2.71 (T-TQN3.41 ~ 3.41 where T —Ti is the temperature difference in degrees Fahr. betweenthe heated surface and the room, and N is the number of square feetof radiating surface. The… … HEATER Fig. 4,404.—Underseat method of car heating; view showing seat and placement of heater.At the Montreal meeting of the American Street Railway Association some years ago,Mr. J. F. McElroy read an exhaustive paper on the subject of car heating, from whichthe following abstracts are taken: In…
Electrical engineering
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