WITH SPRING SWIVEL. 345 



will admit of, in order to avoid, as much as possible, 

 all extra strain occasioned by lever ; as, of course, the 

 longer the ears of the swivel, the more severe the 

 strain on the neck, and on every thing else below it. 



Size.J 



Height, altogether 9i inches. 



Thickness of the ears in the thinnest part (where the 



pin goes through) each one 4- an inch. 

 Diameter of the upper circle, neck, or collar, 2^- inches. 

 ^Diameter of the lower cylinder, or stem, 1^ inch. 



Weight 7-r pounds. 



The wooden block of the punt, or whatever the 

 gun is fired from, receives both the neck and the 

 stem, so that on this plan the lever, or strain, 

 operates only as far as the lower part of the ears. 



B. THE SWIVEL-PIN. 



Diameter of the cylindrical part, -J- of an inch. 

 Length (exclusive of the threads of the screw, and the 

 head and square shoulder) 3 inches. 



