The contact between cable and connector should be clean and tight.
The top of the post should not come flush with the top of the connector.
The connector or attachment plug should be of rubber or solid plastic and have a metal cord grip fastened to it.
Fig. 62 shows how the connector should be slipped upon a thin piece of metal, M, like that on the galvanoscope, for example.
The connector may be located at either end of the flexible conductor or inserted in the conductor itself.
The wires are always working loose; projecting ends are bare, and if the connector is twisted, a short circuit results.
As will be shown later, the normal way of releasing the switches is from the connector back over the release wire.
It has already been stated that the connector is of the same general type of apparatus as the first and the second selectors.
Busy-Back Signal:—The connector has dropped back to normal in all respects.
This grounds the vertical side of the line at his station and operates the vertical relay at the connector.