. Electrical world. sher that is supported on the rear Century Transmitter.—The transmitter manufactured by theCentury Telephone Construction Company resembles in some re-spects that made by the Western Electric Supply Company. TheCentury transmitter, however, differs in having its diaphragm madeof iron 2Y2 in. in diameter and .018 thick covered with varnish toprevent rusting. There are two carbon electrodes each ;< in. indiameter, the rear one screw-ed to a bridge made of cast brass. InFig. 29 the Century transmitter with the rear cover removed isshown, while in Fig. 30 it is
. Electrical world. sher that is supported on the rear Century Transmitter.—The transmitter manufactured by theCentury Telephone Construction Company resembles in some re-spects that made by the Western Electric Supply Company. TheCentury transmitter, however, differs in having its diaphragm madeof iron 2Y2 in. in diameter and .018 thick covered with varnish toprevent rusting. There are two carbon electrodes each ;< in. indiameter, the rear one screw-ed to a bridge made of cast brass. InFig. 29 the Century transmitter with the rear cover removed isshown, while in Fig. 30 it is dissected entirely. The capsule ismade of a piece of very thin rubber tube, about ^ of an in. indiameter and s/32 in. long. It contains a piece of felt to whichtwo mica discs are cemented. Each carbon electrode is supportedby a disc of brass about Ys of an in. greater in diameter than theelectrode, and after the capsule is filled with 10 grains of granu-lated carbon the mica washer; nrp r. 1 .1,,, f^jf ring, thus. FIG. 34, — >\M;D15U-.\.\IERICAX , CAl KKMUVED. retaining the capsule in position. In this instrument both the frontelectrode and the entire capsule can move with the vibration of thediaphragm, but here all comparison of the previously-mentionedtransmitter ceases. To check undesirable vibrations of the dia-phragm the Century transmitter provides two thin pronged ironsprings, as shown in Fig. 30. Each of these is secured to the edge ofthe face plate by means by two screwS, as is shown in Fig. 29. The Strombcrg-Carlson Transmitter.—The first of the so-calledCornplaster type transmitters, and one of the widest knownmodels is that manufactured by the Stroniberg-Carlson Company,as shown in elevation in Fig. 31, and opened in Fig. 2,2. This trans-mitter differs materially from general designs, so far is much smaller and lighter, for the case consists merely of twopieces of pressed brass. The diaphragm is of tin and is secured inthe front
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
