TRACT 34.
IN GUNNERY, 1791.
' 135
On vibrating the pendulum after the experiments endedthis day, for the centre of oscillation, it performed 405 vi-brations in 10 minutes, or 405 per minute, which was 40Tat the beginning. But by computing the variation in thevalue of n, from the change in the weight, it gives only adifference of 2: I have therefore assumed the value of n atfirst; to be 40 2, and at the end 40 - 4.
Weighed and balanced the pendulum, when its weightand centre of gravity were found to be as below.
Centre of Gravity,
On one side . . 76-65
On the other side . 76-80
The medium of both 76‘72Ditto at beginning 75 - S5Medium nearly . . 76-3
Wt. added, changesthccentre -4, its half is 02
Correct at beginning 76 - lDitto at the end . 76-5
For the Weight.
Weight at firstTen balls lodged 60£Plugs wt . . 6jr
Additional ditto 2The sum isWeight at the endTheref. lost by eva-
1
1629^
69
1698*
1694
nnrntmn
176. July 18, 1791.Barometer 29'75; Thermometer 71.
Attended the weighing and balancing the gun, also firedthe same charges of powder without balls, as had been usedthe last two days with balls.
N°
Pow-
der
Length
Charge
Vibr.
gun
1
oz
32
inches
6*8
294
2
32
6-5
295
3
24
5-3
220
4
24
5-3
221
5
16
3-7
141
6
16
3-7
140
7
8
2-9
63
8
8
2-8
64
Oz
2
2
2
My Eprouvette.
Chords Vers.
43 9 '\,
3 > large grains43 9J-) 05
45 10j small grains
The gun vibrated 38 + permin. See its weight, dimen-sions, &.c, July 13.