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 334
rough the filament in amounts of 70, 30 and 20 per cent, ofthe normal amount. In use, the variation is made by pulling onestring to add resistance and thus dim the light; or by pulling theother string, the resistance is decreased and more electricitypasses through the filament to produce a brighter… … Fig. 223.—The resistancetype of ** turn-down lamp. 324 MECHANICS OF THE HOUSEHOLD
Heating · Lighting · Plumbing
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