Tunzelmann, George William von, 1856- · New York, Scribner & Welford · leaf 166
tstone auto-matic transmitter, which was described in the last chapter. CHAPTER XII. THE TELEPHONE. The first recorded attempt to transmit speecli by electricitywas made by Philipp Reis, a German schoolmaster, whobegan his researches in the year i860. His first transmitterwas formed out of the bung… … ^l.COLLISftC Fig. 40.cube of wood, hollowed out in a conical form, and havingthe smaller end of this hollow closed with a very finestretched membrane. A narrow springy strip of platinumfoil was attached to the upper binding screw, as shown inthe diagram, while its lower end rested against the…
Electric industries · Electricity
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