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 354
ELECTRICITY 343 coils. When the current ceases to flow in the magnet coils, thecores are demagnetized and the armature is drawn back by thespring A to the original position. As soon as the contact isrestored at /^ a new impulse is received only to be broken asbefore. In this manner the bell… … -jr r -r ~r ~r -|i Fig. 239.—Example of an electric doorbell installation. degree by this adjustment. When properly set the screw islocked in place by a nut and should require no furtherattention. Electric bells vary in price according to design and work-manship. A bell outfit may be purchased…
Heating · Lighting · Plumbing
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