Experiments upon Gunpowder. 



In order to determine how much of the force of the 

 powder was lost by windage, and by the venf, oiled 

 leather was fastened round the bullet, so that it now 

 accurately fitted the bore of the piece ; and in the five 

 experiments, from No. 35 to No. 39, inclusive, the 

 valve-vent was made use of. 



Weight of the bullet, together with the leather in 

 which it was enveloped, 603 grains. 



VOL. I. 



