. Automatic telephony; a comprehensive treatise on automatic and semi-automatic systems . ach of theother banks. In this way all pairs of the samenumber are multipled together. A feature of the connector relays, which shouldbe understood, before discussing the circuit, is theuse of slow-acting coils. Such a coil is contrivedby placing a heavy ring or cylinder of very pure copper over one endof the core of the spool, occupying a portion of the space used for the Fig. 54.—Switch shaftand wipers. « * g gj - r ■ -ts/r # ft THfefc r «s rtfiBflBBJBUhi- <* yj£& •^yj L %JF Fig. 55.—Connector-switch
. Automatic telephony; a comprehensive treatise on automatic and semi-automatic systems . ach of theother banks. In this way all pairs of the samenumber are multipled together. A feature of the connector relays, which shouldbe understood, before discussing the circuit, is theuse of slow-acting coils. Such a coil is contrivedby placing a heavy ring or cylinder of very pure copper over one endof the core of the spool, occupying a portion of the space used for the Fig. 54.—Switch shaftand wipers. « * g gj - r ■ -ts/r # ft THfefc r «s rtfiBflBBJBUhi- <* yj£& •^yj L %JF Fig. 55.—Connector-switch bank, unwired. winding on an ordinary spool. The outside diameter of this ring, whichhas a rectangular cross section, is the same as that of the spool head, andthe inside diameter is just large enough to allow the ring to fit snugly over 56 A UTOMA TIC TELEPHON Y the core. (See Fig. 58.) A relay of this type attracts its armaturenearly as quickly as an ordinary relay, but when Ihe circuit through itswinding is broken the current induced in the heavy copper ring retains. Fig. 56.—Detail of connector-switch bank. the armature for the fraction of a second, giving it a very noticeable explained more fully in the description of the circuits of this system,
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttelephone, bookyear19
