Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 39
FIGS. 15 AND le.-BERLINEES PATENT-OFFICE MODEL. THE BATTERY TRANSMITTER. 17 num disc secured to the diaphragm. The plumbago button washeld against the diaphragm by a spring, the tension of which couldbe adjusted by a thumb-screw. A form of Edisons transmitter, devised by George M. Phelps in1878, is… … FIG. 17.—PHELPS-EDISON TRANSitlTTER. in the small cut at the right of this figure, and is inclosed in a cup- 7shaped case formed of the two pieces, A and B, as shown. Securedto the front of the enlarged head, c, of the adjustment screw, E, is athin platinum disc, F, against which rests a…
Telephone
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
