Abstract
THE trouble taken by large manufacturing firms abroad to acquaint foreigners with their products and the work they have done is worthy of imitation. During this year, the telephone factory of L. M. Ericsson of Stockholm has published two reviews written in excellent English and well illustrated, each giving about 70 pages of most readable matter mainly about automatic telephones and exchange stations. There is a description of a system which notifies electrically on panels in a bank the quotations from the stock exchange immediately they are fixed officially. These panels can be inspected by the public. The methods of protecting transmission lines from excess voltages due to atmospheric electricity by means of condensers are described and a full scientific description is given of their action. There being so many wooden buildings in Sweden, there is a great demand for automatic fire alarm systems. When a fire breaks out, the effects of the fire itself acting on the device at once summon the fire brigade. The new Ericsson bakelite telephones are described. A description is given of automatic exchanges in Iceland, Norway and Finland and there are many beautiful photographs. With the beginning of this year, the firm started publishing a series of highly technical papers on the theory of telephony and allied subjects. Of the four we have seen, one is in French and three are in English. They record much of the work carried out by the Research and Development Department of the Company.
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Manufacture of Telephones in Sweden. Nature 132, 999 (1933). https://doi.org/10.1038/132999a0
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DOI: https://doi.org/10.1038/132999a0