22 O. N. Rood on Elongated Projectiles. 
rrel: it was cast with inclined bands on it, extending for two- 
thirds of its length and corresponding to the grooves of the barrel: 
Initial velocity. No.of Rey. Distance. 
157°9 ft. ‘ 
1475 30 ft. Flight accurate. 
being made to rotate was allowed to fall from a height 
and it was found that six revolutions per second en- 
abied it to remain point foremost in a fall of five 
feet, while 20 per second sufficed for a fall of 45 feet. 
e only question that now remains is, if 700 or 
ity, why should this rate of rotation not be commu- 
nicated to it? The answer is found in the practical difficulties ; 
ximum number of revolutions per second that can prop- 
erly be communicated to a ball is from 500 to 550, and man 
will be ready to deny that even this rate can be employed wide 
to the action of the grooves in the rifle, and has been found to correspond with their 
direction. No such deviation was observed by Gen. Jacobs (page 27 of Rifle Prac- @ 
it has never been rved in the American rifle where the recoil is very small, and a 
the trajectory very much flattened, though it is the custom of our marksmen on calm 
days to practise at targets placed indi 
