Telephones and Telegraphs

Telephones and Telegraphs

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... than one circuit. A further development of recent years has been the more general use of the telephone for fire alarm service. This arose in a natural and simple manner from the fact that telephone subscribers in many small towns would call a€œcentrala€ to ask where the fire was. ... The auxiliary circuit has a special battery, and is not connected electrically with the regular circuits of the fire alarm system.

Title:Telephones and Telegraphs
Publisher: - 1906

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