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.