The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 605
at its centre, and alsoof so connecting subsidiary diaphragms for the granule cellsto the centre of the main diaphragm as to ensure a maximum 576 APPENDIX vibration in the microphone cell or cells. Fig. 519 showsone of the arrangements given, the fly nut on the top leftside being one of about 6… … Fig. 519.—Egner and Holmstrom Transmitter(By permission of the Proprietors of Electrical Engineering) phone cells only is shown with a spring and screw arrange-ment for adjustment. For further particulars see ElectricalEngineering for 7th October 1909, also The Electrician, 19thNovember 1909. The…
Telephone
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