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 356
isopened beyond a certain point. The attachment shown in Fig.242 is intended to form the contact for a window. It is set in thewindow frame so that the lug C will be depressed and close thealarm circuit in case the sash is raised sufficiently to admit a man.Each window may be furnished with a… … FIG.24I FIG .24-5 FIG.242Fig. 241.—The electric buzzer.Fig. 242.—Contact for a window burgier alarm.FjG. 243.—Trip contact which announces the opening of a door.Fig. 244.-—Contact for a door alarm.Fig. 245.—Doorway or hall matting with contacts for electric alarm. and doors are sometimes connected…
Heating · Lighting · Plumbing
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