180
EXPERIMENTS WITH
TRACT 36.
both the flat and round sides, it appears, that, their resist-ances increase in a ratio a little higher than that of thesquare of the velocity: but how much higher, will be deter-mined hereafter, as well as several other inferences.
28. Juvk 26, 1786.
Barom. 29-96 ; Thermom. ; very warm.
Having previously got prepared, for the remaining expe-riments, a flat disc, or very short cylinder, also a completeglobe, and a cone, all of pasteboard, and of the same diame-ter of the preceding largest hemisphere; I proceeded to try,whether a different figure hindmost, as well as foremost,would make any difference, and what, in the results: thus,the hemisphere, the cylinder, and the cone, each with thecircle foremost, have three different figures hindmost; andvice versa: also the sphere and hemisphere, with the roundside foremost, have different figures hindmost; all of whichcircumstances will make a great variety of cases. Had theapparatus all well adjusted; the instrument nicely levelledand fixed; and had the upper pulley, over which the cordof the weight passed, fixed so high, as to have 30 or 40 turnscompleted, before the actuating weight could reach the floor;which would give the medium more exactly of a great num-ber of rounds. The following numbers are the mediums,each of 30 rounds, found by subtracting the time of the 3rdround from that of the 33rd, and dividing the remainderby 30.—The cylinder was used this day, and consequent-ly a flat side both before and behind. Its weight was 5 oz1 dr.
V. eight
Time
1 Weijilit
Time
We
da
rime
We
glit
Time
oz dr
Sec.
1 uz dr
see.
oz
dr
SPC.
oz
dr
sec.
2 0
1510
3 4
10-57
'3
12
9-50
4
12
8-23
2 2
14-40
3 6
1032
4
0
9-07
5
0
7-93
3 0
11-13
3 8
9-90
4
4
8-83
5
4
7-72
3 2
10-85
3 10
9-73
4
8
8-50
5
8
7-47