. Automatic telephony; a comprehensive treatise on automatic and semi-automatic systems . 154 A UTOMA TIC TELEPHON Y the same for both wall and desk sets. The same condenser is used fortalking and ringing. There are three shunt springs on the calling the shunt operates, it opens the receiver circuit and short circuitsthe transmitter. Dialing is done through the 1-2 winding of the induc-tion coil. Since the circuits of telephones used with different types of coincollectors and meters are shown in Chapter IV they will not be repeatedhere. Second Class—Intercommunicating Systems of th
. Automatic telephony; a comprehensive treatise on automatic and semi-automatic systems . 154 A UTOMA TIC TELEPHON Y the same for both wall and desk sets. The same condenser is used fortalking and ringing. There are three shunt springs on the calling the shunt operates, it opens the receiver circuit and short circuitsthe transmitter. Dialing is done through the 1-2 winding of the induc-tion coil. Since the circuits of telephones used with different types of coincollectors and meters are shown in Chapter IV they will not be repeatedhere. Second Class—Intercommunicating Systems of the Push-buttonType.—Push-button intercommunicating systems such as have been l-i. Fig. J 4 -Circuit of booster telephone, desk. widely used in connection with manual central office equipment andtrunks are also quite generally used at the stations of subscribers toautomatic telephone service, and are arranged with one or more trunksto the automatic central office. These systems are convenient and welladapted to private branch exchanges up to a capacity of ten or 15 sta-tions, but larger sizes are so expensive to install and so expensive toenlarge or change that their use is generally not warranted. When but one trunk is used for a little system it may terminate in alineswitch and connector switch banks the same as any subscribers line M # ttt
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttelephone, bookyear19
