the Force of Fired Gunpowder. 151 



The machinery having been repaired and put in order, 

 the experiments were recommenced in July, I793> 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 Ibs. 

 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. 



