Home Warning Devices (1955)
Home Warning Devices (1955) : "Several studies have indicated the need to supplement the outdoor siren system with some internal warning device to reach a maximum number of people. There are three methods by which this might be accomplished. The first would make use of sending a signal over a powerline either by a momentary change of voltage or by superimposing a signal over a telephone line and the third would make use of the CONELRAD system to transmit the signal by radio. In each instance the transmitted signal would trigger an alarm device within the home would be attached either to the powerline, telephone, or radio. Several contracts have been let to initialing research and development work to produce a feasible and economical home warning device." (FCDA, 1955 Annual Report, 1956, p. 19)
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