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 217
is containedbetween a steel andcarbon plug fittingtightly in a glass tube(see Fig. 6). A tele-Ihone and a singlevoltaic cell are in-cluded in series. Byadjusting the pressure,the current from thecell can be preventedfrom tlowing throughthe contact points be-tween the mercury andthe steel and… … Fig. 6. 2CO RADIOTELEGRAPHY One of the best and simplest of these self-restoring imperfectcontact oscillation detectors is the Tantalum-Mercury contactinvented by L. H. Walter. A fragment of tantalum wire from a tantalum lamp isattached to a platinum wire, and the tip of the tantalumimmersed in…
Radio · Telegraph, Wireless · Telephone, Wireless
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