247 
upon Gun-powder , See, 
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The 
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the Re- 
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1 he bullet-ftruck the 
target below the axis 
of the pendulum. 
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Remarks. 
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Fourth day. 
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15^5 
1027 
Finding that the blaft of the powder always reached as far as 
the pendulum, whep large charges were made ufe of, and fufi- 
pecting 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 ftretehed upon a fquare frame of wood, and iiir 
terpofed as a fereen before the pendulum at the diftance of two 
feet from the furface of the target. 
Two reafons 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 firft 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 
firft, was, that the length of the fioufe did not admit of a greater 
2 1/ % diftance, 
