No. 1 was a Birmingham gun with chambers and 

 barrels correct to standard dimensions. The right hand 

 barrel was nominal cylinder, and the left not quite full 

 choke, the nominal patterns being 140 and 190 with 

 "Bonax" cartridges, No. 6 shot. 



Nos. 2 and 3 were London guns, right barrel nominal 

 cylinder, left barrel full choke. 



In the experiments 1 and 2 with No. 1 gun, two dif- 

 ferent charges were used with the intention of getting 

 velocities over 1 yards of I , I 20 and 1 ,200 ft. respec- 

 tively. The cartridges were loaded with 1 yV oz. No. 7 

 and No. 3 soft shot, but were otherwise identical, and 

 were fired alternately, shot for shot, so that the conditions 

 were as nearly as possible the same. In experiments 3, 4, 

 and 5, 1 i^e oz. of chilled shot was used instead of soft shot. 



It will be seen that with soft shot the choke velocities 



54 



