Census of Electrical Industries

Census of Electrical Industries

4.11 - 1251 ratings - Source

The importance of electricity as a time saver in announcing the existence and location of a fire can scarcely be ... might be utilized for fire-alarm purposes, and in 1852 the first fire-alarm telegraph system was installed in the city of Boston. ... The simplest form of fire-alarm system, frequently found in small towns, consists of but one single circuit with a few ... A manual transmitter is a device used in the larger central fire-alarm stations for sending out alarms to engine and truck companies.

Title:Census of Electrical Industries
Publisher: - 1919


You Must CONTINUE and create a free account to access unlimited downloads & streaming