Abstract
THE author points out that electrostatic machines are used much more on the Continent and in America than in this country, where they do not appear to be held in good esteem. He proceeds to argue that this bad repute is undeserved, and proceeds to investigate the capabilities of this class of machine and the conditions upon which its efficiency and trustworthiness depend. Practically all the types which have been proposed from time to time are described and analysed, and accounts are given of the author's own experiments,. resulting in a type considerably more efficient than the well-known Wimshurst machine. He claims that, as a source of high potential supply, a high-speed influence machine designed on the right lines should be as efficient as an induction coil with all its accessories, and that, principally on account of the continuity of-its supply and the higher voltage available, it should give better results for Rböntgen-ray work, particularly with tubes for high penetration. Other fields in which he suggests that such machines may prove useful include applications to wireless telegraphy, electro-culture, electro-therapeutics, ignition, and the testing of materials..
Modern High-speed Influence Machines.
By V. E. Johnson. Pp. viii + 278. (London: E. and F. N. Spon, Ltd., 1921.) 14s. net.
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Modern High-speed Influence Machines . Nature 109, 103 (1922). https://doi.org/10.1038/109103a0
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DOI: https://doi.org/10.1038/109103a0