COMMUNICATION DEVELOPMENTS 1929

by FRANK B. JEWETT, Ph. D.
President, Bell Telephone Laboratories
Source: Popular Science Monthly – January 1930

IMPROVEMENTS in apparatus, circuits, and methods continue to extend the limits of communication and to im-prove its speed, quality, and depend-ability. Illustrative of this is the proposed transatlantic telephone cable, the main link of which will probably extend 1,800 nautical miles from Newfoundland to Ireland. This project has been made possible by many inventions and developments, chief of which are a new alloy, perminvar, used to “load” the copper conductor in the cable, and a new insulating material known as “paragutta.”

Increase from 1,200 to 1,800 in the maximum number of pairs of telephone wires which can be placed in a standard-sized cable sheath, improved switchboard and private branch exchange equipment, improved textile insulation for wire and apparatus, experimental telephone type-writer exchange service, improved methods of intercity telephone cable construction, and accomplishment of television in colors are other developments.

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4. The Early Days of Television
5. Anthropological Achievements 1929

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