itract S4.
IN GUNNERY, 1791.
133
Whole length of bore, to extremity of the bottom
Diameter of the bore.
Centre of gravity below the axis of motion . .
Centre or axis of the bore below ditto . . .
Weight of the gun alone.
Ditto with all the iron work . -.
174. July 14, 1791.
Barometer 30‘0 ; Thermometer 66.
Began firing the above suspended gun, as follows.
80-5 inc.3'6585-892'21370lb1618
N°
Pow-
der
Vibration of
Point
struck
Plugs
wt
Values of
Velocityof theball
gun
pend
p
g
n
oz
inches
oz
lb
inches
feet
1
32
649
458
84-7
18
1627
7610
40-20
1686
2
•
630
452
87-4
11
1634
15
22
1620
3
•
635
465
88-2
10
1641
20
24
1658
4d
24
569
462
91-9
9
1648
25
26
1588
5
•
549
410
86-2
8
1654
30
28
1508
6
*
549
409
85-9
9
1661
35
30
1517
The gun’s distance was 30feet; diam. of balls 3'55 inches,wt. Gib lioz. Length of the first charges was 9’8 inches; ofthe latter 8 - 3.
O zo
My Eprouvette .
Chords Vers. Arc-
42i 9 24*32'
42i 9 24 32
The powder of last year’s ex-periments gave only between35 and 36 recoil on the chordsof the eprouvette, which an-swers only to 6 on the versed sines: so that the powder ofthis year is considerably stronger than before: yet the men,who had the care of it, asserted that it was the same that re-mained of the former ; but I suspect there is some mistakeon that point, and that it had been removed or changed, andthat they either did not know it, or would not confess it.
The cartridges were now, and hereafter, made of finelawn paper, nicely rounded at the bottom, so as to fit exactlythe bottom of the bore, which is an exact hemisphere; andthe balls were let close into the same paper bags, upon thepowder, with a thread tied round the bag, both below th«