Abstract
IT is now thirteen years since Bellini and Tosi read their paper on “A Directive System of Wireless Telegraphy” to the Physical Society of London. Although Marconi and Fleming had previously done good work on directive radio-telegraphy, it was this paper that first showed British physicists how directive signalling could be obtained by using a fixed aerial and only rotating a small coil of wire. The method, however, lay almost dormant until the war proved its great practical utility. Mr. Walter was one of the pioneers of the Bellini and Tosi system, and in the volume under notice a résumé is given of most of the useful practical information available. The author has utilised much of the theory recently published by the Bureau of Standards and by the Signal Corps of the United States War Department. The mathematics given is of the most elementary description, and will be readily understood by every physicist and engineer. We can commend this book.
Directive Wireless Telegraphy: Direction and Position Finding, etc.
L. H.
Walter
By. (Pitman's Technical Primer Series.) Pp. xii + 124. (London: Sir I. Pitman and Sons, Ltd., 1921.) 2s. 6d. net.
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Directive Wireless Telegraphy: Direction and Position Finding, etc . Nature 109, 270 (1922). https://doi.org/10.1038/109270c0
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DOI: https://doi.org/10.1038/109270c0