Abstract
RADIO engineers will welcome this book by Prof. Gutton. He starts by giving a complete account of the physical phenomena utilised in the three terminal thermionic valve. Full use is made of characteristic curves, and formulae given by Richardson, Langmuir, and Clerk Maxwell are quoted. In the second chapter several good types of apparatus suitable for amplifying are described and approximate formulae are obtained for them. In the next chapter oscillating circuits are given, the theory being well and clearly explained. The theory of the methods of using filters to eliminate harmonics is also given. Next comes the theory of detectors and detecting circuits. Finally the arrangement to get “negative resistance” is shown and the methods of obtaining high frequency currents by utilising suitable valves are described and their useful applications in making electric measurements are explained. The author defines the resistance of a circuit as “negative” when an infinitesimal reduction of the terminal voltage produces an infinitesimal increase in the current.
La Lampe à trois électrodes.
Par Prof. C. Gutton. (Recueil des Conférences-Rapports de Documentation sur la Physique. Vol. 5, 1re Série, Conférences 11, 12, 13. Édité par la Société Journal de Physique. ) Pp. 181. (Paris: Les Presses universitaires de France, 1923.) 15 francs.
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[Book Reviews]. Nature 112, 161 (1923). https://doi.org/10.1038/112161b0
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DOI: https://doi.org/10.1038/112161b0