The standard electrical dictionary : a popular encyclopaedia of words and terms used in the practice of electrical engineering (1898)
Sloane, T. O'Conor (Thomas O'Conor), 1851-1940 · London : Crosby Lockwood and Son · leaf 22
Fig. 8. Burglar Alarm Switch or Circuit Breakzzr. STANDARD ElvECTRICAL DICTIONARY. 17 ing of a window or door. As adjuncts to the system the treads of … Fig. 9. Burglar Alarm Switch or Circuit Breaker. the stairs are sometimes arranged to ring the bell, by completing acircuit when trod on. Door mats are also arranged to close cir-cuits in like manner. For doors and windows switches are provided which are open aslong as the door or window is closed,…
Electricity
Internet Archive · Medical Heritage Library · Public Domain Mark 1.0. Free to use for anything.
