The Bell System Technical Journal, 1933, Vol. 12: Devoted to the Scientific and Engineering Aspects of Electrical Communication (Classic Reprint) - Softcover

Inhaltsangabe

Excerpt from The Bell System Technical Journal, 1933, Vol. 12: Devoted to the Scientific and Engineering Aspects of Electrical Communication

Pen wires were almost universally used for the transmission of speech in the days when telephony was young but gradually as the need arose the art of cable making was evolved. Today, except in the rural districts, the open-wire lines have been almost entirely re placed by aerial or underground cable. The conductors in the early metal covered cables were insulated with one or two servings of cotton but in the late eighties Bell System engineers developed a spirally wrapped paper insulation so much better electrically and lower in cost that it was shortly adopted as the standard insulation for telephone cables by the growing industry.' Now after some forty years of service this type of insulation is being rapidly displaced for inter Office and subscriber loop cables by a pulp insulation applied directly to the conductor by a process which brings the paper mill into the cable plant and combines the paper making and insulating operations into one process with the elimination of a number of costly intermediate steps. In addition, this process makes possible the use of a less expensive material as an insulating medium.

In order to establish a background for the logical consideration of the pulp insulation development it is desirable to cover briefly the materials, equipment and methods that have gradually been developed for the rapid application and economic use of paper ribbon insulation and indicate the limitations involved.

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