WITH SPRING SWIVEL. 349 



if merely soldered on I would never answer for its 

 safety. 



Length altogether, 10 inches. (If longer, and therefore 

 able to admit a longer spring, I should say all the better.) 



c. A little wedge of elm, or walnut-wood, which is 

 pushed into the mortise, c 9 in order to ease the jar that 

 is occasioned by the slider, G, coming in contact with 

 the hinder part of the loop, on re-action taking place. 



This piece of wood must, of course, be replaced with 

 a fresh one, when nearly worn level with the iron. 



D. THE SPIRAL SPRING, which is closed by the re- 

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

 gun forward, and up to its place again. 



Length 6 inches (and if 8 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 

 1 of an inch in girth. 



\_In the last edition / mentioned (though would not, 

 till tried, recommend) Fullerd's plan, and a flat 

 spring. This has been since tried and totally failed. 

 A T o springs have yet answered but those of Westley 

 Richards.'} 



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. 



