Telephones and Telegraphs
... 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 acentrala 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 |
| Author | : | |
| Publisher | : | - 1906 |
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