134
NEW EXPERIMENTS
TRACT 34-
ball and above it, to confine it in its place, near half sunk inthe powder, and the top of the paper over the ball cut off,the neck at the tie being neatly folded down ; all which cir-cumstances render the effects of the firings much more uni-form than heretofore.
The penetrations of the balls into the wood were so deep,that a sharp iron v'ire piercer could not be found longenough, to reach the balls in the pendulum block. After thefirst shot, the piercer or searcher was introduced the depthof 26 inches, without meeting the ball: so that the first pe-netration must have been more than 29{- inches.
After the experiments were ended this day, 2lb additionalof wooden plugs were driven into the pendulum, to wedgeit up close; which therefore must be added to its w'eighthereafter.
175. July 16, 1791.
Barometer 30; Thermometer 69.
The same experiments continued w’ith the lower charges.
N°
Pow-
der
Vibration of
Point
struck
Plugs
wt
Values of
Velocityof ball
gun
pend
p
s
n
oz
inches
oz
lb
inches
feet
1
16
443
340
82-9
12
1668
76-40
40-33
1312
2
16
437
327
81-6
9
1676
45
35
1287
3
8
282
229
81-0
7
1681
50
37
911
4
8
279
220
80-5
9
1688
50
40
884
The balls and distance of the gun the same as before. Thelength of the 16 oz charge 6-75 ; of the 8 oz 5-3 inches.
My Eprouvette.
Oz Chords Vers.
2 42^ 9 7 These with the large grain used in
2 42|. 9 J the experiments.
2 45 9i This charge was w-ith the fine grains
that were sifted out of the powder every day, with a peculiarsifting machine, the large grain being used in the experi-ments. Hence it appears that the fine-grained powder isstronger than the large-grained, at least in this quantity,2 ounces.