110 



Table IX.— Belted Bullet at 80 Feet. 



No. 



n. 



b. 



/• 



V. 







In. 



In. 



Ft. 



1. 



731 



8-62 



71 00 



912-13 



2. 



732 



8-25 



69-00 



901-58 



3. 



734 



8-62 



69-00 



944-59 



4. 



735 



7-62 



66-00 



874-15 



6. 



736 



7-75 



67-00 



876-99 



Mean velocity = 901-88 feet. 



Mean quantity of motion - 62*23 lbs. 



Mean quantity of Work = 869-7'lbs. lifted one foot. 



Collecting the preceding results into one Table, we obtain — 



Table X. 





Velocity at 

 Muzzle. 



Velocity at 

 80 Feet. 



Quantity of Quantity of 

 Motion at Motion at 

 Muzzle. 80 Feet. 



Quantity of 

 Work at 

 Muzzle. 



Quantity of 

 Work at 

 80 Feet. 





ft. 



ft. 



lbs. 



lbs. 



ft. lbs. 



ft. lbs. 



Millie bullet (two- \ 

 grooved), . . . . j 



847 



835-62 



84-33 



83-22 



1109 . 



1080 



Minie bullet (regula- » 

 tion), ) 



909-08 





96-63 





1364 





Sugarloaf bullet, . . . 



863-7 



852-13 



82-63 



81-53 



1108 



1079 



Belted bullet, .... 



1021-68 



901-88 



70-39 



62-23 



1116 



869-7 



Carbine bullet, . . . 



1257-49 





70-24 





1371 





Erom this Table it appears — 



1st. That the quantity of motion communicated by a given quantity 

 of powder to the Minie bullet, discharged from the regulation rifle, is 

 greater than the quantity of motion possessed by any of the other bullets; 

 this result being due partly to the greater weight of the bullet, and 

 partly to the greater length of the rifle. 



2nd. That the quantity of motion communicated to the belted bullet, 

 discharged from the two-grooved or Brunswick rifle, is less than that pos- 

 sessed by the other rifle bullets, this result being due to the lesser weight 

 of the belted bullet. 



3rd. That the quantity of motion communicated to the carbine bullet 

 is equal to that possessed b}^ the belted rifle bullet, although the carbine 

 is shorter and its bullet lighter ; this result being due to the greater fric- 

 tion of the bullet in the rifled barrel. 



4th. That in traversing 80 feet of still air, the quantity of motion of 

 the Minie bullet is diminished by y'g th ; of the sugarloaf bullet by yjth ; 

 and of the belted bullet by ^th, — the remarkable inferiority of the 

 belted bullet being principally due to its shape, which appears to have 

 been contrived so as to cause the maximum amount of resistance to its 

 passage through the air. 



