The standard electrical dictionary; a popular dictionary of words, terms, and phrases, used in the practice of electrical engineering (1897)
Sloane, T. O'Conor (Thomas O'Conor), 1851-1940 · New York, H. W. Henley & co. · leaf 22
Fig. 8. Burglar Alarm Switch or Circuit Breaker. STANDARD ELECTRICAL DICTIONARY. 17 ing of a window or door. As adjuncts to the system the treads of … Burglar Alarm Switch or Circuit Breaker. the stairs are sometimes arranged to ring the bell, by completing acircuit when trod on. Door mats arc also arranged to close ch-cuits in like manner. For doors and windows switches are provided which are open aslong as the door or window is closed, but…
Electricity
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
