upon Gun-powder , &c. 
247 
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The 
charge of 
powder. 
0 
ft & 
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e alcend- 
the pen- 
The bulletflruck the 
target below the axis 
of the pendulum. 
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Remarks. 
, 
N° 
25 
Grs. 
In. 
In. 
Inches. 
Inches. 
Inches. 
Ft.in 
fee. 
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0 
6,8 
65* 
14,95 
1004 
Fourth day. 
26 
7 > 8 
999 
15.6 
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27 
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1027 
Finding that the blaft of the powder always reached as far as 
the pendulum, when large charges were made ufe of, and fuf- 
pedting that this circumftance, together with the impulfe of 
the unfired grains, might in a great meafure occafion the appa- 
rent irregularity in the velocities of the bullets ; to remedy 
thefe inconveniences, a large fheet of paper of a moderate 
thicknefs was ftretched upon a fquare frame of wood, and in- 
terpofed as a fereen before the pendulum, at the diftance of two 
feet from the furface of the target. 
Two reafens confpired to induce me to prefer this method of 
preventing the impulfe of the flame upon the pendulum to the 
obvious one of removing the pendulum further from the mouth 
of the piece ; the firff was, that I was unwilling to increafe the 
diftance between the barrel and the pendulum, left the refiftance 
■of the. air might affedt the velocities of the bullets; and the 
fecond, which I confefs did not operate lefs ftrongly than the 
£rft, was, tliat the length of the houfe did not admit of a greater 
■% L 2, diftance, 
