Novel Telephone Alarm System
Fairfield, Ia., has a novel telephone fire alarm system. The local telephone exchange has installed a small cabinet in its operating room which contains two master switching keys and a regular ringing and listening key. The lines to the homes of the 20 volunteer firemen are brought to the master keys and then to the regular line equipments on the switchboard. When a fire is reported the operator throws the two master keys, cutting off the firemen’s lines from the switchboard. She then uses the regular ringing ley, throwing it into the ringing position which rings the telephones in the homes of the firemen.
After signalling in this manner she throws the key into the listening position and gives the firemen the location of the fire. This provides a very rapid means of calling the volunteer fire department, and it eliminates the chance of an operator neglecting to call one or more members of the department. She rings all, operating a single cam key, and talks to all by the same means.