WITH SPUING SWIVEL. 347 



recoil of the gun, and which, in the reaction, sends 

 the gun forward, and up to its place again. 



Length G inches (and if S or 10 inches, or more, in 

 order to have so much the further play, I conceive 

 it would be a great improvement on what is here 

 sketched). 



Diameter outside, an inch and half. 



Substance of the wire, of which the spring is made 

 nearly J. of an inch in girth. 



[ Was I to make another spring, I should prefer 

 aflat one, to a round one, as the spring would then 

 shut closer ', and be less liable to swerve. Fullerd 

 happened to think of this, as well as of a second 

 sprhtg within the larger one, and is now mounting, 

 for a friend of mine, the best proportioned barrel I 

 ever saw, on this plan. But as I will never publish 

 any thing untried, I have here confined myself to 

 sketches from the one that I have found to an- 

 swer ; though I admit that this is open to improve- 

 ment.] 



E.E. Two ROUNDS OF LEAD, to save the spring, 

 the boss F, and the shoulder of the pin H, from the 

 harder contact of iron. 



F. A BOSS, to fill up that end of the spring 

 which has nothing to prevent it from swerving. 



