the Fo7xe of Fired Gunpowder. 151 



The machinery having been repaired and put in order, 

 the experiments were recommenced in July, 1793, the 

 weather at that time being very hot. 



The principal part of the apparatus, the barrel^ had 

 undergone a trifling alteration : upon refitting and clean- 

 ing it, the diameter of its bore at the muzzle was found 

 to be a little increased, so that a weight equal to 8081 lbs. 

 avoirdupois, instead of being equal to 10,977 atmos- 

 pheres (as was the case in the former experiments), was 

 now just equal to the pressure of 9431 atmospheres. 



Though I was not at Munich when this last set of ex- 

 periments was made, they, however, were undertaken at 

 my request, and under my direction, and I have no rea- 

 son to doubt of their having been executed with all 

 possible care. They were all made by the same persons 

 who were employed in making the first set ; and as 

 these experimenters may be supposed to have grown 

 expert in practice, and as they could not possibly have 

 had any interest in deceiving me, 1 cannot suspect the 

 accuracy of their reports. 



