determine the Velocities of the Rijle Bullets commonly used. 393 



^ = 32-195 feet. Weight of pend. and Minie barrel =56-501bs. 

 T= 1-29 sec. Weight of peud. and carbine barrel = 55-25]bs. 

 « = 61*75 in. 

 OT=314159. 

 /= 74 in. 

 c = 77 in. 

 From these constants we find 



v = 0'UZ26 xnb (3) 



Table IV. — Minie Regulation Rifle. 



Mean velocity =909-08 feet. 



Mean quantity of motion =:96'63 lbs. 



Table V.— Carbine. 



Mean velocity = 1257-49 feet. 



Mean quantity of motion = 70-24 lbs. 



If we assume that the force developed by the explosion of the 

 powder, diminished by the fi-iction of the barrel, is constant, it 

 is easy to deduce the following expression for the velocity 



v=Qxa/I-, 

 V m 



(4) 



in which Q denotes a constant depending on the quantity of 

 powder and diameter of the rifle, s the length of the barrel, and 

 m the weight of the bullet. 



Taking the velocity of the belted bullet, 1021-7 feet, as our 

 datum, and calculating the velocities of the others from (4), \vc 

 find 



