Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 81
also upon the edges of the cavities. Many otherforms of instruments have been devised using one or more ballsheld in various positions between carbon plates. Few are usedto-day, and all the transmitters so far described are being rapidlyreplaced by the Runnings form of instrument, which, as has… … J!f FIG. 44.-THE BERLINER UNIVERSAL TRANSMITTER. this the diaphragm, D (Fig. 44), is of carbon, and is mounted hori-zontally in a case formed of the two pieces, A and B, of hard rubber,a brass ring, R, being clamped above it to insure good electricalcontact. Secured to the enlarged head, /, of the…
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