An elementary manual of radiotelegraphy and radiotelephony for students and operators (1916)
Fleming, J. A. (John Ambrose), Sir, 1849-1945 · London, Longmans, Green & co. · leaf 69
Fig. 11. 52 RADIOTELEGRAPHY If tlie core is periodically mngnetised and demagnetised, it exertsattractive impulses on the iron armature and maintains it inmotion. The break is so connected in the primary coil circuitthat the current flowing through it passes through the jet ofmercury and tlien…
Radio · Telegraph, Wireless · Telephone, Wireless
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