TRACT 34.
IN GUNNERY, 1791.
141
185. Sept. SO, 1791.
Barometer 30-15 ; Thermometer 53.
The powder, which had been hitherto employed, having-been all expended, on trying several new sorts, for a freshsupply, by means of the eprouvette, none of them could befound so strong as the former was. But, by sifting the largegrains out of one of the best of them, the remaining smallgrains of it came up nearly to an equal strength with thatbefore employed; and with this new kind it was that thefollowing experiments have been made, viz, with the long6-pounder gun, at 115 feet distance from the pendulum, thegun being mounted on the truck carriage. The balls, asbefore, weighed 6lb l-§oz, and diameter 3-55 inches.
Eprouvette. After the experiments the pendulum
2oz. 42 vibrated 80 in 2 min. or 40 per min.
2 42^ so that n = 40 in all the rounds.
N°
Pow-
der
Length
charge
Recoil
gun
Vibr
pend
Point
struck
Plug
Wt
Value
p
s of
S
Velocityof ball
oz
inches
inches
c
niches
oz
lb
inches
feet
1
48
12-9
56
396d
85-0
12
1778
76-2
1597d
2
48
12-9
67
444
86-2
1.2
1784
2
1771
3
48
13-0
65
448
90-3
12
1791
3
1715
4
32
9-9
47
382
82-0
11
1797
2
1616
5
32
9-9
49
410
87-2
12
1804
3
1637
6
24
8-5
33
356d
.83-5
14
1810
4
1491d
7
24
8-4
31
322
80-5
11
1817
4
1405
8
24
8-3
32
340
83-6
11
1823
4
1433
9
16
6-9
22
276
79-9
8
1829
5
1223
10
16
6-9
20
304
89-5
11
1836
5
1207
.11
8
5-4
9
214
S8-4
15
1842
5
863
12
8
5-5
9
211
88-2
11
1849
6
857
After the experiments the pendulum weighed 1855lbNow at beginning it weighed . . . 1778
Add for 12 balls . 7 <U
Ditto for the plugs. g3
Sum of these 1860Deduct for loss of lead facing ... 5
Remains the same wt. as at first . . 1855