Abstract
AN article by E. S. McLarn (Elect. Comm., 21, No. 1 ; 1942) describes designs which represent the first successful attempt at evolving a type of subscriber telephone set in which the components are designed and co-ordinated logically with the view of achieving simplified installation, maximum reliability and economy in maintenance. The improvements resulted from lengthy and intensive study of subscriber set behaviour in the International Telephone and Telegraph Associate Telephone Companies, operating under the most diverse conditions. Maintenance cost could be lowered if repairs were reduced to a simplified error-proof mechanical operation, for less skilful help would be required and the training period curtailed. An analysis of telephone set troubles under all kinds of climatic conditions shows that the causes are due principally to (a), excess moisture, dirt, lint and insects, and (b), open- and high-resistance circuits brought about by deteriorated soldered joints, broken conductors and poor contact between conductors and screw-heads.
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Simplified Subscribers' Telephone Sets. Nature 151, 556–557 (1943). https://doi.org/10.1038/151556d0
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DOI: https://doi.org/10.1038/151556d0