14 Experiments upon Gunpowder. 



P is the pendulum, and 



r the ribbon that measured the arc of its vibration. 

 The distance from the mouth of the piece to the 

 pendulum was just 12 feet. 



A TABLE SHEWING THE WEIGHTS AND DIMENSIONS OF 

 ALL THE PRINCIPAL PARTS OF THE APPARATUS. 



Of the Barrel 



Inches. 



Length 44.7 



Length of the bore from the muzzle to the 



breech-pin ...... 43-45 



Diameter of the bore ..... 0.78 



Thickness of metal at the lower vent . . 0.36 

 Thickness of metal at the muzzle . . . o.i 



Weight of the barrel, together with the solid breech-pin 

 and the vent-screws and vent-tube, 6 Ibs. 6 oz. 



Of the Gun-Carriage. 



Inches. 



Length ........ 28.4 



Distance between the two pair of trunnions . 25.6 



Diameter of each trunnion .... 0.25 



Weight, 40 Ibs. 14 oz. 



Of the Rods by which the Carriage was suspended. 



Length from the axis of suspension or center of 



the pivots, to the center of the trunnions Incl , es 

 of the gun-carriage . . . . .64 

 Weight of each rod, i Ib. 4 oz. 



Total weight of the barrel and its carriage, together 

 with the allowance that was made for the weight of the 

 rods by which it was suspended, 48 Ibs. 



N. B. This was its weight from experiment No. 3 

 to experiment No. 123, inclusive. 



