The practical telephone handbook and guide to the telephonic exchange by Poole Joseph

Author:Poole, Joseph. [from old catalog]
Language: eng
Format: epub
Tags: Telephone
Publisher: London, New York, Whittaker & co.
Published: 1906-03-25T05:00:00+00:00

Fig. 276

raising the resistance of the bell branches to a very high figure, such as 20,000 ohms, or more, so that the current passing through the line relay is insufficient to actuate it.

The stations having their bells connected to the a wire are designated by having X and 1, 2, 3, 4, or 5 added to their ordinary line number and those connected to the b wire have Y and 1, 2, 3, 4, or 5 also added. The stations are called by code, a number of rings being given corresponding to their number on the wire—all the bells of the stations connected to the same leg of the loop being rung at the same time, those on the other leg being undisturbed. The X station bells are rung by the regular ringing key of an ordinary C.B. switch-board, but the Y stations require the con-

PARTY-LINE WORKING

271

nections to be reversed, so as to connect the generator to the b wire of the loop. This is done by a second ringing key, as

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