File:Bell telephone magazine (1922) (14569541528).jpg

Identifier: belltelephonevol3132mag00amerrich (find matches)
Title: Bell telephone magazine
Year: 1922 (1920s)
Authors: American Telephone and Telegraph Company American Telephone and Telegraph Company. Information Dept
Subjects: Telephone
Publisher: (New York, American Telephone and Telegraph Co., etc.)
Contributing Library: Prelinger Library
Digitizing Sponsor: Internet Archive

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whichmade it possible to transmit communi-cations over the same wires used tocarry power. This new mediumhelped to meet expanding communica- oo Bell Telephone Magazine SPRING tions requirements of the power com-panies for several years, but it hadlimitations. The frequency rangesoon became saturated in many areasand the addition of new drops onthe carrier circuits made attenuationa serious problem, particularly in pro-viding relatively long-haul communi-cations. Today, with the constant increasein power usage, and improvements inthe transmission of electric energy,larger and more economically oper-ated power plants are being locatednearer to sources of fuel supply.Power companies are interconnectingto form power pools for the exchangeof power, and the complexity of com-munications requirements has multi-plied. Such interconnections, properly con-trolled by high quality, extensive, andoften complex communications sys-tems, permit pooling of reserve ca-pacities and provide a maximum de-
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The district superintendent of a large pipe line watchesthe indicators on a control panel which report valve andpressure conditions at a remotely controlled measuringstation nearly 60 miles dista)it, while he talks to gascontrol headquarters 1500 miles away. Through tele-phone facilities he can dial into five similar stations toobtain like information or to open and close valves gree of reliability of power to individ-ual plants or areas. By coordination,deficient supplies of power in one areacan be supplemented by surplus sup-plies from other power plants in the in-terconnected network. The peak loadsin different areas usually do not occurat the same time. This is principallydue to differences in time zones anddifferences in the load demand be-cause of load and occupational diver-sity in various areas. Wilmington, Delaware, and Atlan-tic City, New Jersey, exemplify thebenefits gained through the flexibilityof power pools. During the day, gen-erating stations produce huge quanti-ties

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