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 331
ashingmachine. Even though the motor is only 50 per cent, efficientits cost of operation is less than 7 cents per hour. Miniature Lamps.—Miniature electric lamps include all thatare not used for general illuminating purposes. The term appliesmore particularly to the form of the base than to the…
Heating · Lighting · Plumbing
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