_Dean_. In Fig. 85 is shown a decidedly unique hook switch for wall
telephone sets which forms the standard equipment of the Dean Electric
Company. The hook lever _1_ is pivoted at _2_, an auxiliary lever _3_
also being pivoted at the same point. The auxiliary lever _3_ carries
at its rear end a slotted lug _4_, which engages the long contact
spring _5_, and serves to move it up and down so as to engage and
disengage the spring _6_, these two springs being mounted on a base
lug extending from the base plate _7_, upon which the entire
hook-switch mechanism is mounted. The curved spring _8_, also mounted
on this same base, engages the auxiliary lever _3_ at the point _9_
and normally serves to press this up so as to maintain the contact
springs _5_ in engagement with contact spring _6_. The switch springs
are moved entirely by the auxiliary lever _3_, but in order that this
lever _3_ may be moved as required by the hook lever _1_, this lever
is provided with a notched lug _10_ on its lower side, which notch is
engaged by a forwardly projecting lug _11_ that is integral with the
auxiliary lever _3_. The switch lever may be bodily removed from the
remaining parts of the hook switch by depressing the lug _11_ with the
finger, so that it disengages the notch in lug _10_, and then drawing
the hook lever out of engagement with the pivot stud _2_, as shown in
the lower portion of the figure. It will be noted that the pivotal end
of the hook lever is made with a slot instead of a hole as is the
customary practice.

The advantage of being able to remove the hook switch bodily from the
other portions arises mainly in connection with the shipment or
transportation of instruments. The projecting hooks cause the
instruments to take up more room and thus make larger packing boxes
necessary than would otherwise be used. Moreover, in handling the