The Shot- Gun. 



771 



between the barrels, have their surfaces wrought to portions of cylin- 

 ders whose common center is the center of the hinge -joint. These 

 cylindrical surfaces fit closely in the corresponding slots W, W cut 

 in the breech-action. The cartridge-extractor is shown at R. It is 

 worked by a cam attached to the fore-end. When the gun is opened, 

 or "broken," this cam presses forward the rod of the extractor, and 

 pushes out the cartridges sufficiently to allow the fingers to remove 

 them. P is the extension-rib which fits in a recess cut in the break- 

 off. When the gun is closed, bolts enter the slots S,S' and the hole 

 in the extension-rib,, and firmly and securely lock the barrels to the 

 breech-action. To unlock and open the gun, the top-lever, L, is 

 pressed from left to right ; this draws the bolts and the gun opens. 



,o\ 



PATENT TRKBI.E WEDGE-EAST GUN. 



This engraving shows the appearance of one of Mr. W. W. 

 Greener's guns when opened. The breech-action and locking gear 

 just described are those of one of these guns. 



The parts of an ordinary bar-lock are shown on page 772. War- 

 ren's "Shooting, Boating, and Fishing" (Scribner and Sons, 1871). 

 The longer leg of the mainspring, 8, has a hook or claw at its end 

 which rests on the pin of the swivel, shown linked to the right of the 

 tumbler, 2. The action of this swivel is to increase instead of dimin- 

 ishing the force of the spring as it unbends on the descent of the 

 hammer, 3. The interposition of the swivel between the tumbler 

 and mainspring causes the latter to act with increasing leverage on 

 the tumbler as the spring unbends. This increasing leverage will be 

 apparent to any one who will compare the pressure of the thumb 

 on the hammer when it is just lifted with what it is just before the 

 hammer catches at full cock. In the tumbler are cut two notches, 



