lO Experiments upon Gunpowder. 



2, 2, 4, 4, are the trunnions by which it was sus- 

 pended. 



d^ e, is the barrel in its proper place, 



p is the breech-pin, which, passing through a hole in 

 the middle of the bar, a, b, c, supports the end e of the 

 barrel ; and 



n is the ring that supports the end d of the barrel. 



Fig. 9 represents a perpendicular section through the 

 line 2, 2, Fig. 8, and in a line perpendicular to the length 

 of the barrel. 



This figure is designed to shew the manner in which 

 the muzzle of the piece was supported and confined in 

 the ring n, Fig. 8. 



a, Cy are the two ends of the bar that are seen cut off. 



n is the ring, and 



0, ^, are the screws by which it is fastened to the two 

 parallel sides of the bar, the ends of which screws form 

 the trunnions 2, 2, Fig. 8. 



^ is a transverse section of the barrel, and 



r, J-, /, are the three screws by which the barrel is sup- 

 ported and confined in the center of the ring. 



Fig. lo is the same as Fig. 9, but upon a larger scale, 

 and without the letters of reference. 



Fig. 1 1 represents the two ends of one of the pendu- 

 lous rods by which the barrel was suspended ; and Fig. 

 13 shews the same seen sideways. 



^, b^ is the rod which is seen broken off". 



f, d^ are the pivots by which it was suspended by a 

 pair of hooks that were fastened to an horizontal beam, 

 in the same manner as the pendulum for measuring the 

 velocities of the bullets was suspended. 



e^ f, are the hooks which receive the trunnions that 

 are fixed to the carriage. 



