TRACT 36.
THE WHIRLING-MACHINE.
181
29. June 27, 1786.
Barom. 529*94-; Therm. 65, at 9 A. M.
w<
ight
Time
Wt
Time
Wt
Time j
Wt
Time
OZ
dr
sec-
OZ
sec-
OZ
S'C. i
oz
sec.
5
12
7-23
9
5-60
20
3-67 ;
64
1-97
6
0
7-05
10
5‘ 32
22
3-48 ;
72
1-88
6
4
6-87
11
5'02
26
3-20 !
80
1-80
6
S
6-67
12
4-78
30
2-97
90
1-67
7
0
6-47
13
4-58
34
2-77
100
1-60
7
8
6-23
14
4-38
40
2-53
no -
1-53
8
0
6-00
16
4-10
48
2\-;0
120
1-50
8
8
' 5-90
18
3-87
.56
2-10
Thread
broke.
30. June 28, 1786.Barometer 30 06 ; Thermometer 65.
Experiments with the whole sphere; wt. 8 oz 14 dr.
2
14-5
12
3-35
30
2-07
80
1-22
3
8-55
14
3T
34
1-9.5
90
1-15
4
6'7 5
16
2-85
40
1-8
100
1-07
5
5'7 5
18
2-7
48
1-65
110
1-02
6
5-1
20
2'6
56
1-5
120
0-97
8
4‘3
22
2'45
64
in
10
3-8
26
2'22
72
1-3
31. The globe required the first weight, or 2 oz, just toput it in motion ; and a less weight than 2 oz would not stirit at all. This was owing probably in part to the greatweight of the globe, which was made of very thick paste-board, and partly to the great length of the silk cord, be-tween the barrel and the weight, at first to be moved, whichwas not less than 23 feet in length. These extra weightscausing greater friction and resistance on the machine, itwas to be expected that the times of revolution, with thesame actuating weights, would be greater, and considerablyso when those weights should be very small; but that thedifference would gradually diminish as the weights increase;till at length they might become insensible, if the difference