Pock′et-knife.
A knife having one or more pivoted blades, which shut within the handle, and are held firm by the back, which constitutes a spring.
The blades are forged on a small anvil with a light hand-hammer by drawing down a rod of steel and cutting off sufficient to form the blade and joint.
In making the latter a second heat is taken, and the finish is completed at a third heat; they are then hardened by plunging while redhot in cold water, and tempered by laying them side by side on an iron plate over the fire, where they remain until their surfaces assume a purple or brown color.
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Knife with detachable blades. |
Fig. 3861 is a knife in which the shank of the blade is so slotted that it can be readily slipped on or off the customary pivot in the handle.
A lever device is used to retract the spring when the blade is to be inserted or removed.
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Knife with watch-key. |
Fig. 3862 has a watch-key in place of one of the blades.
