Carrier Telephony on High Voltage Power Lines

T HE use of power from hydro-electric generating stations and central steam plants has increased until single companies serve a territory of many thousands of square miles and the problem of coordinating the distributing centers with the generating stations has steadily increased in complexity. One of the essentials of this coordination is obviously an adequate system of communication and until the recent advent of high frequency telephony, this service was secured over privately owned telephone lines and over lines of public service telephone companies.