66
THE NATURE AND
[sect. II.
liquids. It may be proper to observe, that the various thermometers used in these
experiments were duly adjusted to a good standard one.
After repeated experiments by all these methods, and a careful comparison of
the results, he was enabled to digest a table of the force of steam from water of all
the temperatures from 32° to 212V The only experimental results were the fol
lowing, which are compared with our formula.
Dalton’s Experiments on the Force of Steam.
Temperature of
steam.
Force in inches of mercury.
Temperature of
steam.
Force in inches of mercury.
Dalton’s obser
vations.
By Rule
page 59.
Dalton’s obser
vations.
By Rule
page 59.
32°
0-2
0-172
133°i
4-76
5-24
431
0-297
0-281
1441
6-45
6-95
541
0-435
0-442
155f
8-55
9-10
65f
0-63
0-675
167
11-25
11-7
77
0-91
1-00
1781
14-6
15-1
881
1-29
1-447
1891
18-8
1915
99i
1-82
205
2004
24-0
2407
noi
2-54
2-85
212
30-0
300
122
35
3-89
From these results he determined the ratio belonging to each interval, and filled in
the intermediate degrees by interpolation, considering the forces to increase in a
geometrical progression. Above 212° he made no trials at that period, though the
table was extended to 325°, and has since been found to be erroneous for the
temperatures above 212°.
97. Mr. Dalton afterwards re-examined the subject, and considers from va
rious trials, that the force of steam at 32° cannot be less than 02 of an inch ; and
is most probably 0*25 : but with the advantage of having seen the results of
Dr. Ure’s and Mr. Southern’s experiments, and having made new experiments
himself for the temperatures between 212° and 300°, he gives the following table,
formed from what he considers the most correct experiments on the subject. 1 2
Temperature of
steam.
Force of steam in inches of mercury.
Temperature of
steam.
Force of steam in inches of mercury.
Dalton’s numbers.
By Rule
page 59,
Dalton’s numbers.
By Rule
page 59.
36°
0-29
0-201
173°
1318
13-46
64
0-75
0-633
220
34-20
34-92
96
1-95
1-84
272
88-9
86-2
132
507
507
340
231-0
236-
1 Nicli. Phil. Journal, vol. vi. p. 263. 8vo.
2 Annals of Philosophy, vol. xv. p. 130. for 1820.