58 Experiments upon Gimpowder. 



Upon an inspection of this figure, as well as from an 

 examination of the foregoing table, it appears that the 

 velocities determined by the two methods agree with 

 great nicety in all the experiments after the 8yth ; but in 

 the 8yth experiment and also in the 86th, but particu- 

 larly in the Sfth, the difference in the result of these 

 different methods is very considerable : and it is remark- 

 able that in those experiments, where they disagree most, 

 the velocities of the bullets, as determined by the pen- 

 dulum, are extremely irregular ; while, on the other hand, 

 the gradual increase of the recoil as the bullets were 

 heavier, and the great regularity of the corresponding 

 velocities, afford good grounds to conclude that this dis- 

 agreement is not owing to any inaccuracy in the new 

 method of ascertaining the velocities, but to some other 

 cause, which remains to be investigated. 



But before we proceed in this inquiry, let us separate 

 the five last experiments in the foregoing table; and 

 summing up the velocities determined by the two meth- 

 ods, we shall see by their difference how those methods 

 agreed, upon the whole, in this instance. 



Velocity. 



Weight of !'> tlir By the 



Experiments. the Bullets. Recoil. Pendulum. Difference. 



On. 



88th 600 1240 1229 -\- ii 



603 1224 1229 5 



90th 1184 1017 978 -f- 39 



91 st 1754 893 916 23 



92d 2352 812 833 21 



Sums & difF. of the Velocities, 5186 5185 -f~ i 



Here the difference in the result of the two methods 

 does not amount to s-^W tn P art f tne wn l e velocity ; 

 but I lay no stress upon this extraordinary argument. 

 I am sensible that it must in some degree have been 



