TRACT ,34.
IN GUNNERY", 1785.
37
92. Friday, September 9, 1785 ; from 9£ till 1.The weather very fine and warm.Barometer 29 - 93 ; Thermometer, within, 66°.
N°
Vibrat
pend
Point
struck
plugs
Values of
Veloc,
ball
Penetr*
V
g
■n
inches
inches
lb
inches
feet
inches
1
99
79-0
9
805-3
78-48
40'06
1162
16-7
2
107
823
10
806-7
49
06
1208
16-4
3
114
87"1
10
808-1
50
07
1218
16-7
4
115
87"3
9
809-6
51
07
1228
mediums 1204 16-6
The charge of powder was 4oz ; the ball’s diameter 1-965,and weight 16 oz 12 dr.
These 4 rounds were fired into the same pendulum as wasleft hanging on September 2, which had been kept undercover since that time. After these 4 rounds, it weighed81 lib, which is 2|lb less than it ought to be, when theweight of the 4 balls and plugs are added to its formerweight, and which 2^ lb it must be supposed to have lost byevaporation in the course of the 7 days, which was mostlydry, warm weather.
The plugs weighed 9 oz to 14| inches.
Mean length of the charge 3'0.
We could not venture to fire down the river this day, onaccount of the great number of ships that were upon it.