_1_ is pivoted at _3_ on a bracket _2_, which serves to support all
the other parts of the switch. The contact springs are shown at _4_,
_5_, and _6_, and this latter spring _6_ is so designed as to make it
serve as an actuating spring for the hook. This is accomplished by
having the curved end of this spring press against the lug _7_ of the
hook and thus tend to raise the hook when it is relieved of the weight
of the receiver. The two shorter springs _8_ and _9_ have no
electrical function but merely serve as supports against which the
springs _4_ and _5_ may rest, when the receiver is on the hook, these
springs _4_ and _5_ being given a light normal tension toward the stop
springs _8_ and _9_. It is obvious that in the particular arrangement
of the springs in this switch no contacts are closed when the receiver
is on the hook.

[Illustration: Fig. 84. Short Lever Hook Switch]

Concerning this latter feature, it will be noted that the particular
form of Kellogg hook switch, shown in Fig. 83, makes two contacts and
breaks two when it is raised. Similarly the Western Electric Company's
makes two contacts but does not break any when raised. From such
considerations it is customary to speak of a hook such as that shown
in Fig. 83 as having two make and two break contacts, and such a hook
as that shown in Fig. 84 as having two make contacts.

It will be seen from either of these switches that the modification of
the spring arrangement, so as to make them include a varying number of
make-and-break contacts, is a simple matter, and switches of almost
any type are readily modified in this respect.

[Illustration: Fig. 85. Removable Lever Hook Switch]