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Title: Optimum Use Of Communication Circuits For Contorl & Telemetering
Author: Graham D. Bogel
Source: 1970 American School of Gas Measurement Technology
Year Published: 1970
Abstract: The use and growth of telemetering in industrial control has closely paralleled the growth of the communications systems within the country. Telemetering, which literally means measuring at a distance, must certainly have been practiced from earliest times. From the time men learned to signal at all, they signaled the size of armies and herds of animals during the hunt. Our interest, however, is in automatic telemetering. Automatic telemetering depends on the availability of dependable electrical communications. As telegraph tie-ups between communications systems came into use, they were first used to send ON-OFF type of information, particularly in the presence or absence of trains on railroad tracks, and the familiar fire and burglary alarm functions. These direct current type systems grew tremendously, until all types of nation-wide and international networks were in use.

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