on some of tieleading Doctrines of Caloric, &c. 99 
of 10°, with the number +0-011, the signs being employed as 
in the preceding cases. 
TaBce V. 
Elastic Force of the Vapour of Alcohol compared with the 
atios. 
Caleu-; Ob- p Calcu-| Ob- 
Calcu-} Ob- 
Temp. lat. lat. |served. Temp. lat. | served, 
served | a 
250° }130°24 |139°3 170° | 28-3 | 2883 90° | 3-41 | 3:40 
240 /111°13 111-24 |} 160 22 46| 226 | 80 2°52 | 2:45 
230 | 93:94 | 94-1 150 rg 18:0 70 1-85 | 1:76 
220 | 78:67 | 785 140 15-8 13°9 60 1°35 | 1:23 
210 | 65-29 | 65-0 || 130 1065; 106 50 | 0°97 | 0:86 
200 | 53:69 | 53-0 120 8°16) 8:10 40 | 0°69 | 0-56 
190 | 43-76 | 43-2 110 6'2 6:00 30 0-49 | 0-38 
180 | 35-35 | 34-73 || 100 | 4°67| 4-50 
eh UE OA eit) ae Vil 
we = 22-46... 28-3 x Tap oiT = 35°35 
28-3 x 126011 X 126-009 = 43-76 &e. 
a 17°, &c. 
The correspondence here exhibited between the observed and 
calculated elasticities is remarkable 3 nor does the difference ever 
exceed what would be produced by an error of 1° in the con- 
struction or reading off of the thermometer. This may fairly be 
deemed the limit of accuracy in such an experiment. 
Oil of turpentine is regulated by the constant ratio 1-122, 
which converts any elastic force into that 10° above or below, 
-multiplying as usual in the former, and dividing in the latter case. 
For petroleum the ratio is 1:14 ; it is also constant, 
The following table exhibits a comparative view of theory and 
experiment, rm 
Taece VI. 
Oil of Turpentine. | Petroleum. 
Temp. (Caleulae. Observed. || ‘emp. | Calculat. | Observed. 
——————-—— 
310° | 3355. |) 320° | 31-7 
320 | 37-7. 37-06.| 330 | 36-2 | 364 
330 | 425.) 42-1 || 340 41-2 | 416 
340 | 47:7 | 47:3 350 | 47:0 | 46°86 
350 | 535 | 53+8 360 | 53°6 | 533 
ous | 60-4. 60°8 370 61+1 60:7 
i 
G2 The 
