American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 456
ignal boxes are supplied. This service has quite recently and after much opposition been introduced in Lon-don, Eng. CHAPTER XXVI. Automatic Burglar Alarm Telegraphy. The object of automatic burglar alarra telegraph systems, or, as they are alsofrequently termed, Electric Protective systems, is to… … MS >f^ BURGLAR ALARM TELEGRAPH SYSTEM CONNECTIONS. One of the plans on which such systems are arranged is the following: In the protected building a net-work of wires is run in partitions across doors, sky-lights,etc. These wires are a part of a circuit extending to the central office and the…
Telegraph
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