% 4-2 
Mr \ Thompson's Experiments 
A table fewlng the weights and dimenjions of all the principal 
parts of the apparatus, 
- Of the barrel . 
Inches. 
Length «*>« • « « 44,/ 
Length of the bore from the muzzle to the breech-pin 43,45 
Diameter of the bore . . . . 0,78 
Thicknefs of metal at the lower vent •. . 0,36 
Thicknefs of metal at the muzzle . . 0,1 
Weight of the barrel, together with the folid breech-pin, and 
the vent-fcrews and vent-tube, 6 lbs. 6 oz. 
Of the gun carriage . 
Length . . . 
* 
28,4 
Didance between the two pair of 
trunnions 
A 
Diameter of each trunnion 
• « 
°> 2 5 
Weight 40 lbs. 14 oz. 
Of the rods by which the carriage was fufp ended. 
Length from the axis of fufpenhon, or center of the pivots, to 
the center of the trunnions of the gun carriage, 64 inches. 
Weight of each rod, 1 lb. 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 fufpended, 48 lbs. 
N. B. This was its weight from experiment N 6 3. to experi- 
ment N° 1 23. inclulive. 
Of 
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