2 Mr. Thompson’s Experiments 
Fig. 9. reprefents a perpendicular feftion through the liner 
2, 2, fig. 8. and in a* line perpendicular to the length of the 
barrel. 
This figure is defighed to fhew the manner in which the 
muzzle of the piece was fupported and confined in the ring n, 
%• 8 . 
a 9 c 9 are the two ends of the bar that are feen cutoff! 
n r is the ring y; and 
0 , p, are the fcrews by which it is fattened to the two parallel 
fides- of the bar, the ends of which form the trunnions 2, 2y 
%. 8 . 
d, is a tranfverfe fection of the barrel, and 
r, s 9 t , are the three fcrews by which the barrel is fupported 
and confined in the center of the ring. 
Fig. 1 a. 13 the fame as fig. 9. but upon a larger feale. 
Fig. i t . reprefents the two ends of one of the pendulous 
rods by which the barrel was fufpended ; and fig. 13. fhews the 
'feme feen fideways.. 
a\ h 9 is the rod which is feen broken off. 
Cyd) are the pivots by which it was fufpended by a pair of 
hooks or : grooves that were fattened to an horizontal beam, in 
the fame manner as the pendulum for meafuring the velocities 
of the' bullets was- fufpended; 
e. f 9 are the hooks which receive the trunnions that are fixed 
to the carriage. 
The climenfions of every part of this apparatus may be feen- 
in the table, p. 24.2. 
.The chord of the arc through which the barrel afeended in- 
its recoil was meafured by a ribbon, and the lengths of thofe 
chords/ exprefed in inches and decimal parts of an inch, are 
fet down ih the tables. The method of computing the vek> 
c 
city 
