[ 87 ] 
XV. New experimental Researches on some of the leading Doc- 
trines of Caloric; particularly on the Relation between the 
Elasticity, Temperature, and latent Heat of different Va- 
pours; and on thermometric Admeasurement and Capacity. 
By Axnprew URE, M.D. 
(Continued from p. 44.] 
TaBLeE I. 
The elastic Force of the Vapour of Water in Inches of Mercury. 
Iii 
| € 
a 
mr 
Force. 
Force 
Temp. 
Force. 
o 
3) 
~~ 
° 
= 
Force. 
| Temp. 
rH 
§ 
= | 
24°| 0-170 |/115° 2-320. 1952 |21°100 ||/242° |53°600 |/270 | 86-300|/295-6]130°400~ 
32 | 0°200 |'120 | 3:300!|200 |23:600//245 [56-349 |/271-2, 88-000|/295 |129:000 
* 40 
50 
55 
60 
0°250 ||125 | 3830 ||205 }25°900 ||/245-8/57°100 ||273.7, 91-200;/297°1)133-900 
0-360 130 | 4°366 |210 |28-880 ||248-5/60°400 |/275 | 93°480|/298-8)137°400 
0-416 135 | 5-070 |2.2 |30-:000|/250 |61°900 ||275-7, 94-600||300 |139°700 
0°516 |\140 | 5°770 ||216°6/33 400 |!251-6/63°500 |/277-9 97°800)||300 6|140°900 
65 | 0°630 ||145 | 6-600 |220 |35°540 ||254-5|66-700 |/279-5 101-600|/302 |144-300 
70 | 0°726 ||150 | 7°530 |221°6|36-700 ||255 |67-250 |/280 |101:900)|/303-8}147-700 
75 | 0860 155 | 8-500 ||225 |39:110 |)257-5/69 800 |/281-8 104°400||305 |150°560 
80 {| 1:010 ||160 | 9.600 |226°3/40°100 ||260 |72+300 |/283-8 107-700)|306-8)}154:400 
85 | 1:170 ||165 |10°800 |230 |43-100 |/260+4/72-800 |/285-2 112°200)|S08 |157-700~ 
90 | 1-360 |/170 |12-050 230 5/43 500 ||262°8/75 900 ||287°2 114°800)/310 |161°300 
95 | 1:640 ||175 |13-550 ||234-5|46-800 |/264:9/77-900 ||289 118 200),311-4]164:800" 
100 } 1°860 ||180 |15:160 |235 |47:220||265 |78-040 ||290 |120°150)/312 |167:000 
105 | 2°100 ||185 |16°900 ||238-5/50°S00 |/267 |81.900 ||292°3 123°100||Another exp. 
110 | 2:456 ||190 |19 000 }240 |51°700 |/269 |84°900 }/294 126°700)312° \165°5 
' 
The apparatus employed in obtaining these results, has the 
peculiar advantage over all others, that the mercurial column is 
never heated. It is the concurrent opinion of all chemical phi- 
losophers, that caloric travels downwards in liquids with extreme 
slowness and difficulty. Indeed, Count Rumford’s experiments 
led him to infer that heat could not descend in fluids at all. 
It is evident that in my constructions, figures ], 2, and 3, only 
that small portion of quicksilver, within the vessels A, B, and C, 
will be affected by the heat, but the measuring column is be- 
yond the reach of its influence. 
A surprising accordance will be perceived between my num- 
bers, and those given by Mr. Dalton between 32° and 212°, 
though mine were obtained with a different modification of ap- 
paratus. Above the boiling point, where the table of Mr. Dal- 
ton is deduced from calculation, the accordance soon ceases. But 
as my apparatus and mode of using it were precisely the same 
as in the former part of the range, my results, if entitled to con- 
fidence in the one case, must be so in the other, At 280° Be- 
tancourt’s number and mine are not much different, the former 
F4 being 
