Figure 3-4.-The sound-powered telephone handset and handset holder.
THE SELECTOR SWITCH
Sound-powered telephone selector switches (fig. 3-5) are
located throughout the ship at control and operating stations
served by more than one sound-powered telephone circuit. The
selector switch enables you to talk on any one of several circuits
by turning the rotary dial on the switch to the desired circuit.
Most of the switches are installed with a sound-powered
telephone handset hard-wired into the switch. In areas where a
handset is not provided, you must insert a headset-chestset plug
into the jack outlet. Selector switches located in normally
darkened condition areas are provided with dial illumination.
When talking from a station with a selector switch, how
do you shift from one circuit to another?
Selector switches in darkened-ship condition areas are
provided with what special feature?