. American telephone practice . on that account, if on no other. The frontelectrode, C, is composed of a brass screw, r, having an enlargedhead to which is soldered a hard carbon disc, c. This is secured bymeans of a nut to the front inner face of a chamber formed in thediaphragm in a manner readily understood from the assembled 64 AMERICAN TELEPHONE PRACTICE. drawing. The rear electrode, D, is similarly made up of a carbondisc, d, soldered to a brass disc, d, having a prolonged screw-threaded shank. The shank of the rear electrode, D, passes througha mica washer, £, and a heavy brass bushing,
. American telephone practice . on that account, if on no other. The frontelectrode, C, is composed of a brass screw, r, having an enlargedhead to which is soldered a hard carbon disc, c. This is secured bymeans of a nut to the front inner face of a chamber formed in thediaphragm in a manner readily understood from the assembled 64 AMERICAN TELEPHONE PRACTICE. drawing. The rear electrode, D, is similarly made up of a carbondisc, d, soldered to a brass disc, d, having a prolonged screw-threaded shank. The shank of the rear electrode, D, passes througha mica washer, £, and a heavy brass bushing, F, having an enlargedface to clamp the mica washer against the rear face of the parts are tightly clamped together by means of a small nut, assembling the parts thus far, the proper amount of granularcarbon is poured into the chamber, b, on top of the front electrode,after which the rear electrode, with the mica washer, is put in place,and the mica washer is firmly riveted to the diaphragm by means of. FIG. 48.—DETAILS OF KELLOGG TRANSPUTER. an aluminum ring, G, and the small rivets, g. Under the heads ofone of the rings is fastened a small clip, g, by which electrical con-nection is afterwards made with one of the terminals of the trans-mitter. The diaphragm of the transmitter is thus made, to carrywith it the chamber and both electrodes, the chamber being perma-nently closed by means of the mica washer riveted in place, as de-scribed. The diaphragm thus assembled is surrounded by a softrubber ring, b, held in place against the front piece by two heavydamping springs, as in the case of the solid back transmitter. Thebridge, H, is secured at its ends to the rear face of the front, A. This CARBON TRANSMITTER. 65 bridge carries lit its center the heavy bushing, h, into which the bush-ing, F, of the rear electrode fits. The screw, h\ serves to hold therear electrode rigidly with respect to the bridge after it has oncebeen adjusted. A terminal block, /,
Size: 1553px × 1608px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., boo, bookcentury1900, bookdecade1900, bookidamericantelepho00mill
