[ 45 1 1 
the other Experiments reported by the Committee, 
and on the Circumftances of thofe Trials on which 
the Author founded the prefent Poftulate. The Au- 
thor has fuppofed the Powder, on which he reafons 
in this Treatife, to be of the fame fort with that 
made for the Service of the Government, a Parcel 
of which he was favoured with by Mr. Walton. But 
this he chiefly kept for a Standard, and generally ufed 
other Powders, which, on Examination, he found to 
be of equal Force. Thefe Powders were of a very 
fmall and even Grain, and the Committee have 
found, that by lifting the Government Powder, and 
making ufe of the fmaller Grains, the Quantity re- 
maining unfired was lefs, at a Medium, in the 
Ratio of 5 to 3 ? than when it was ufed without 
lifting. 
And again, it was found by extrading the Salt- 
petre from the Powder colleded unfired, that there 
was lefs Saltpetre contained in it than in real Powder, 
and this nearly in the Ratio of 9 to 7 : Thefe Two 
Proportions compounded make the Proportion of 1 5 
to 7, and in this Proportion muft the Quantities of 
Powder colleded unfired be reduced, in order to 
determine the Quantities of real Powder remaining 
unfired, in limilar Experiments made by the Author. 
And from hence it follows, that in the Experi- 
ments made with a Barrel 5 -f Inches in Length, where 
the Ball had not 3 Inches to move, and where the 
Irregularity arifin'g from the Powder unfired ought to 
have been the mod fenfible, the Quantity of real Powder 
colleded unfired from a Charge of 1 2 dwt. would have 
been no more than 16 Grains at a Medium, or ~ 
of 
