394 The Rev. S. Haughton's Account of Eocperiments to 

 Table VI. — Theoretical and observed Velocities. 



Minie bullet iu two-groove rifle. 



Sugarloaf 



Regulation ^linie 



Carbine bullet 



The agreement of these results is very striking in the case of 

 the rifles, and proves the truth of equation (4) ; and the disagree- 

 ment in the case of the carbine proves, as might be expected, 

 that the force of the powder is greater in the smooth bore than 

 in the rifle. From the preceding results we may assert with 

 confidence, that the velocity with which a bullet is propelled from 

 a rifle by a given charge of powder depends mainly on the weight 

 of the bullet and the length of the bairel, varying inversely as the 

 square root of the former, and directly as the square root of the 

 latter*. 



The following experiments were made to ascertain the resist- 

 ance of the air to bullets of difi'erent figures and weights. The 

 bullets were fired at 80 feet distance, from the two-gi'oove rifle 

 into the pendulum, and the velocities calculated from formula (1). 



The constants of the pendulum were — 



^ = 32-195 feet. •S7 = 3-14159. 



T = 1-29 sec. c=77in. 



a = 60 in. Weiglit of pend. after Exprs. = 51-20 lbs. 



Table VII.— Minie Bullet at 80 feet. 



Mean velocity = 835-62 feet. 



Mean quantity of motion = 83-22 lbs. 



* The former of these laws was proved by Mr. Hutton to hohl for smooth 

 bore njuns of large size, but the latter did not hold true for his cxj)eriments. 

 I suppose the reason it is nearer the truth in rifles is on account of the 

 increased friction in the latter. 



