the Force of Fired Gunpowder* 



141 



ment with attention. I should not indeed have thought 

 it necessary to mention this circumstance, had I not 

 been afraid that some one who should calculate the joint 

 capacities of the bore and of the vent tube from their 

 lengths and diameters, rinding their calculation not to 

 agree with my determination of those capacities, as as- 

 certained by filling them with mercury, might suspect 

 me of having committed an error. The mean diameter 

 of the bore of barrel, as determined from its length and 

 its capacity, turns out to be just 0.2281 of an inch; 

 the diameter of the vent tube being taken equal to 0.07 

 of an inch, and its length 1.715 inch. 



TABLE I. 



Experiments on the Force of Fired Gunpowder. 



