. American telephone practice . rma-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 oncebe
. American telephone practice . rma-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, /, of hard rubber, is secured to the rear sideof the bridge upon which is mounted a terminal, i, to which a wireleading from the clip, g, is soldered. The lug, i, therefore formsone terminal of the transmitter, it being in electrical contact withthe front electrode. The other terminal is formed by the frame ofthe transmitter itself, it being in contact with the rear electrodethrough the bridge, FIG. 49.—THE STROMBERG-CARLSON TRANSMITTER. In this transmitter the piston action of the electrodes is obtainedas in other forms, the rear electrode being held rigid while the frontelectrode vibrates with the diaphragm. The flexible mica washerserves to allow a slight relative motion between the two electrodes,this washer also serving to completely close the chamber to preventthe escape of the granules or the entrance of moisture. Besidesthe piston action of the electrodes, it will be seen that practically theentire mass of granules is caused to be agitated by the vibration ofthe diaphragm, and therefore a certain amount of microphonicaction may be expected from this cause alone. Certain it is, how-ever, that this is an exceedingly powerful form of transmitter. It 66 AMERICAN TELEPHONE PRACTICE. was developed by Mr. W. W. Dean after a long and most carefulseries of experiments. In Figs. 49 and 50 is shown the transmitter of the Stromberg-Carlson Telep
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