TRACT 34.
IN GUNNERY, 1785.
33
90. Friday , September 2, 1785 ; from 9 till 3.
The weather rather windy and cloudy.
Barometer 29"8 ; Thermometer within 66°.
Went with Major Blomfield and the same class of cadets,and made the following set of 14 experiments, the first8 balls being fired into the pendulum, and the other 6 downthe river, to get the corresponding ranges.
N°
Vibr.
Point
W
bp
Values of
Veloc.
pend
struck
CU
p
S
n
ball
tration
inches
inc
lb
inches
feet
inches
1
128
81-0
10
795-0
78-33
40-07
1438
18-0
2
139
85-7
9
796-6
35
07
1479
19-9
3
141
90-3
11
798-3
38
07
1428
4
146
92-7
12
800-0
40
07
1444
16-7
5
163
96'2
12
801-6
43
06
1557
20-3
6
171
94-0
10
803-2
45
06
1675
20-7
n
149
89-1
13
804-8
47
06
1543
16-4
8
144
91-5
11
806-4
50
06
1457
16-6
Time
sec
Range
feet
means 1503
18-9
9
14
6110
10
6060
11
not
12
seen
13
5760
14
5735
mean
5916
The charge of powder was always 8 oz; the ball’s diameterT965, and weight 16 oz 13 dr.
The Gun was n° 2. It was not hung on an axis, as in thetwo former years, but mounted on a small carronade car-riage, made for the purpose, both in the last 6 rounds,which were fired down the river, and in the first 8 rounds,which were fired into the new pendulum, at the same di-stance as formerly, or about 35 feet, and each ball into aVOL. III. D