Mechanics of the household; a course of study devoted to domestic machinery and household mechanical appliances (1918)
Keene, E. S. (Edward Spencer), b. 1864 · New York, McGraw-Hill book company, inc.; · leaf 335
Fig. 223.—The resistancetype of ** turn-down lamp. 324 MECHANICS OF THE HOUSEHOLD … into heat. When the Hght is burning at its dimmest only 20 percent, of the normal current is used. Under this condition thelight given out by filament does not express the high efficiencyattained when the lamp is burning at its full power but it doesgive a convenient form of light regulation with…
Heating · Lighting · Plumbing
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