Telegraphy, telephony, and wireless by Poole Joseph

Author:Poole, Joseph
Language: eng
Format: epub, pdf
Tags: Telecommunication
Publisher: London, Sir Isaac Pitman

FIG. 42

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STANDARD SWITCHBOARD

TELEPHONY

67

pairs of connecting cords and plugs accommodated on the horizontal shelf above (only one cord of the twenty used is shown in the figure) with weighted pulleys to keep the cords straight and tidy when pulled up for connection.

The ten operators' listening-and-ringing keys, corresponding to the ten pairs of cords, are accommodated on the lower shelf, each pair opposite its respective clearing drop.

Drops. —The signal drops or " indicators " used on

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