American telegraph practice; a complete technical course in modern telegraphy by McNicol Donald Monroe 1875-

Author:McNicol, Donald Monroe, 1875- [from old catalog]
Language: eng
Format: epub
Tags: Telegraph
Publisher: New York, London, McGraw-Hill book company
Published: 1913-03-25T05:00:00+00:00

Fig. 203.—Binding-post connections of a Neilson single-line repeater.

THE TOYE REPEATER

In the Toye repeater, no extra magnets or repeating sounders are required. The main-line relay of the wire being repeated into is prevented from releasing its armature, by shifting the main battery from the line to an artificial circuit consisting of a resistance box or rheostat, having a resistance approximately equal to that of the regular line wire to the distant station. The operation of shifting the battery from main to artificial line is performed by the transmitter.

Operation of the Toye Repeater. —By referring to Fig. 204 it may be seen that should the distant eastern office close his main-line key the armature of relay R at the repeating station will be attracted, thereby closing the local battery circuit of transmitter T, placing the lower lip of the transmitter lever points in contact with the line extending to the distant western station. This places the western battery to line west. While the distant eastern station continues to transmit, relay R* and transmitter T remain closed. The manner in which the silence of these two instruments is maintained con-

* It will be shown in Chapter XVIII dealing with multiplex repeaters that full sets of repeaters are usually so provided with table switches, that they may be "split" or divided so that one-half of the set may be used to connect a single line into a duplex set, or into one side of a quadruplex set, at a repeater station.

Digitized by VjOOQIC

SINGLE-LINE REPEATERS

235

West Line

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