_2_ and the brass strip _6_, may be lifted bodily out of the standard
_1_ by taking out the screw _7_ which holds the strip _6_ in place, as
is clearly indicated. On the strip _6_ there is mounted the group of
switch springs by which the circuit changes of the instrument are
brought about when the hook is raised or lowered. The spring _8_ is
longer than the others, and projects upwardly far enough to engage the
lug on the switch-hook lever _2_. This spring, which is so bent as to
close the contacts at the right when not prevented by the switch
lever, also serves as an actuating spring to raise the lever _2_ when
the receiver is removed from it. This spring, when the receiver is
removed from the hook, engages the two springs at the right, as shown,
or when the receiver is placed on the hook, breaks contact with the
two right-hand springs and makes contact respectively with the
left-hand spring and also with the contact _9_ which forms the
transmitter terminal.

[Illustration: Fig. 86. Desk-Stand Hook Switch]

It is seen from an inspection of this switch hook that it has two make
and two break contacts. The various contact springs are connected with
the several binding posts shown, these forming the connectors for the
flexible cord conductors leading into the base and up through the
standard of the desk stand. By means of the conductors in this cord
the circuits are led to the other parts of the instrument, such as the
induction coil, call bell, and generator, if there is one, which, in
the case of the Western Electric Company's desk set, are all mounted
separately from the portable desk stand proper.

This hook switch is accessible in an easy manner and yet not subject
to the tampering of idle or mischievous persons. By taking out the