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 394
is more expensive except when electricitycan be obtained at a very low cost, and moreover, the cost ofthe heating devices is high. 3,048 HAWKINS ELECTRICITY With an electric cooker, the surrounding atmosphere is not heated toanything like the extent that it is by a coal, gas, or oil cooking… … Fig. 4,388.—Simplex electric coffee percolator. Starting with cold water, through the cir-culating process as shown, drip coffee is ready in a few minutes, depending upon thedegree of strength required. Three degrees of heat are provided, permitting quickmaking, and allowing the coffee to be kept…
Electrical engineering
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