3 68 
Dr. Ure’s new experimental researches 
Tables VII. and VIII. 
Dalton's theory of the thermometric scale, compared with the 
observed temperatures and tensions of vapours. 
Aqueous Vapour. 
Ethereal Vapour. 
Dalton’s 
geom. pro- 
gression of 
elasticity. 
Dalton’s 
new scale of 
temperat. 
FAH REN. 
Observed 
elasticity. 
Dalton’s 
progression 
of elasticity. 
Dalton’s 
scale. 
Fahren. 
Observed 
elasticity. 
22.7 inch. 
202° 
1 99 ° 
23.1 in. 
6.1 
32 ° 
32 ° 
5.81 
30.0 
212 
212 
30.0 
9.16 
5 2 
46.6 
8.67 
39 5 
222 
225 
39 - 11 
* 3-77 
72 
62.55 
12.60 
52.0 
232 
238.6 
50-3 
20.65 
92 
79.84 
18.40 
69.0 
242 
252.6 
64.5 
3 *.o 
1 12 
98.50 
27.2 
91.0 
252 
266.8 
81.5 
46.54 
132 
1 18 50 
377 
120.0 
262 
281.2 
io 3-5 
69.88 
*52 
* 39-9 
56.8 
* 5 «- 
272 
296.2 
I 3 I -7 
104.91 
172 
162.4 
83.3 
208. 
282 
3 »i *5 
164.8 
* 57-5 
192 
186.5 
1 * 8-3 
236.5 
212 
212 
169.0 
The numbers of the first and fourth column ought evidently 
to agree, if the theory be just. Their differences, on the con- 
trary, are prodigiously great. At 272 0 of his scale, for 
example, equal to 296°. 2 of ours, the law of progression 
makes the elastic force of aqueous vapour amount to 158 
inches : experiment gives 13 1.7 ; and I am confident, that the 
latter cannot be in error above an inch or two. Again at 
262°, equivalent to 28 i°.2 Fahrenheit, his theory gives the 
force of the same vapour at 120 inches; by observation it is 
only 103.5. Now at this part of the scale, my result is con- 
firmed by the concurrence of those obtained by Betancourt 
and Robison. I consider this demonstration complete. If 
we compare these very elasticities of Mr. Dalton, with the 
table formerly given by the same philosopher,* we shall find 
• Manchester Memoirs, vol. 5, 
