ce 
At 
oe pee 
18 O. N. Rood on Elongated Projectiles. ® 
the attention of our own makers to the propriety of diminishing 
the calibre, and increasing the speed of the ball.” 
Dimensions of the rifles employed. 
Twist of grooves 
Length of Barrel. Weight. Calibre. jgaining, ending in 
one turn in inches. 
Ibs. 0 
No. 1. 30°5 in 16 0 | 0°46 in. 
No. 2. "310 “ 9-07! 0-34." 42°35 
No. 3. $0°4 “ To HOS: * 
No. 4. 120 Pit OOO a 47:37 
No. 5. es ak O20 2* 12°85 
They were all provided with the sights known as the “ Globe 
and Bead,” as well as with set locks. Nos. 1 and2 were sup- 
plied with the false or loading muzzle, and all with the excep- 
tion of No. 5 had “ guide-starters,” which ensured the accurate 
placing of the ball in the barrel. Linen patches were in every 
case employed, not greased, but moistened, it being now retty 
well understood that the latter afford the more accurate practice. 
Asa general thing, after each shot the barrel was wiped out with 
a slightly moistened rag, dampness being guarded against by a 
repetition of the process with one that was dry, 
known and there are writers who advocate progress in this — 
direction, imagining naturally enough that a ball modeled 
after the lines of a ship would experience less resistance in — 
pers through the air than its shorter and blunter rival. — 
m 
e months ago, filled with this idea, I constructed a ball 
of the model shown in Fig. 1, sharp both at bow 1. 
and stern, and having of course its centre of gravity . 
wise the twist of the grooves, the rate of revolution *‘ong iameters 
of such ball per second is easily found ; thus, if the Weight 222 gra 
initial velocity should be 1000 feet per second and the twist one 
