Electrical engineer's pocket-book: a hand-book of useful data for electricians and electrical engineers (1901)
Foster, Horatio A. (Horatio Alvah), 1858-1913 · New York, D. Van Nostrand co.; London, E.& F.N. Spon, ltd. · leaf 152
n fheVir-cuit will not then weaken the battery. IP T MAT Fig. 45. Diagram of Burglar-Alarm Mat, two Bells,one Push and Automatic Drop ; all operated by onebattery. Both bells ring from one push or mat, asdesired, by changing the switch. When mat is to be used, throw it into the circuitby the…
Electrical engineering
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