When the butterfly nut is released, the spring
action of the conductors opens the contacts and
restores the switch to its normal, or open,
position.
The push-to-talk handset switch
usually is mounted in the telephone handset
between the transmitter and receiver (fig. 30).
So located, the telephone user can connect the
battery readily when speaking and disconnect it
when listening.
Figure 31 shows another
handset with a push-to-talk switch. When
speaking, the switch is pressed downward
instead of sideways. On this handset, the
receiver unit has been made almost flat to allow
the unit to be slipped under a helmet.
FIGURE 30. Handset with Push-to-Talk Switch
FIGURE 31. Military Handset with Push-
to-Talk Switches.
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