TRACT 34.
IN GUNNERY.
375
61. Wednesday, September 10, 1783 ; from 10 till 12.The weather was fine.
Barometer 29‘7 ; Thermometer 60° at 10 a. m.
N°
.Pow-
der
Ball’s
Vibration of
Point
struck
1 Plugs
Values of
Veloc.
ball
wt
diam
gun
pend
p
S
n
02
oz dr
inches
inches
inches
inches
inc
lb
inches
feet
1
2
2-5
2
2
2-2
3
2
2-45
4
4
5-8
-
5
4
5-8
6
4
5-7
7
8
12-1
8
8
12-1
9
8
12-2
10
8
16 12*
1-96
24-5
ISO
88*3
5
671-4
77-48
40-19
,1315
11
8
16 12*
1-96
25-1
19-3
89-5
8
672-8
77-50
40-19
1394
12
8
16 12*
1-96
24-8
18-1
86-8
6
674-3
77-52
40-19
1351
13
4
16 12*
1-96
15-85
14-65
88-5
7
675-7
77-54
40-19 1075
14
4
16 12*
1-96
15-7
14*1
87-4
6
677-2
77-56
40-19
1050
15
4
16 12*
1-96
16-35
15-4
88-5
3
678-6
77-59
40-18
1136
16
2
16 12*
1-96
100
10-75
89-3
4
679-S
77-61
40-18
787
17
2
16 12*
L-96
9-9
10-6
89-8
3
681-1
77-63
40-18
774
18
2
16 12*
1-96
10-1
10-65
88-0
3
682-3
77-65
40-18
795
The Gun n° 1. Weight and other circumstances as usual.The Pendulum as left hanging since Monday. Its radius,&c, as usual.—The value of i, or the mean distance amongthe points struck this day and the former, is 88‘0.
The plugs weighed 1 oz per inch.
Weight of Powder
2oz
4oz
8 os
Mean length of the charge -
1-9
3-2
5-7
Mean recoil with ball - -
10-00
15-97
24-8
Ditto without - - - -
2-38
5-77
12-1
Difference, or c = - - -
7-62
10-20
12-7
Hence velocity by the recoil
838
1122
1396
Mean ditto by the pendulum
785
1087
1353
Difference, the recoil more,
53
35
43
Or nearly the part - -
X
rr
i
7T
T
'ST