Abstract
AT first sight, automatic telephony appears to be a hopelessly complicated subject. Yet next year it will be necessary for all telephone subscribers to begin to get a working knowledge of it, as the British Post Office decided a year ago that automatic equipment is to be adopted in all important areas. We wonder whether in the future it will be well known that the “double dog “is knocked away until the wipers clear the banks and that during this process the stationary dog supports the weight of the shaft. In any case these terms will have to be included in technical dictionaries. The list of British standard terms made by the Engineering Standards Association and included in this volume is excellent. The advantages of the automatic system are the large savings that can be effected in the annual charges, the continuous day and night service, and the increased efficiency and accuracy. The disadvantages are the greater capital cost and maintenance charges; and the increased liability to faults at the subscribers' end. To the intelligent reader who wishes to understand the basic principles of the ordinary systems in use, we can recommend this book.
Automatic Telephones.
F. A.
Ellson
By. (Pitman's Technical Primers: Double volume.) Pp. xii + 215. (London: Sir Isaac Pitman and Sons, Ltd., 1924.) 5s. net.
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Automatic Telephones. Nature 114, 428 (1924). https://doi.org/10.1038/114428c0
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DOI: https://doi.org/10.1038/114428c0