Tunzelmann, George William von, 1856- · New York, Scribner & Welford · leaf 175
162 ELECTRICITY IN MODERN LIFE. its reverse side an iron ring, rr, Fig. 50, to which arescrewed two pieces, bb, opposite to each other. These areconnected by the conducting rail c, which is kept in … position by means of the brass plate m and the screw n.The iron diaphragm e is placed immediately behind thefunnel-shaped mouthpiece a. Between the diaphragm and THE TELEPHONE. 163 the vertical rail c, the upper part of which is bent at rightangles, there is an interval of about three-quarters of…
Electric industries · Electricity
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