202 
ON THE DENSITY OE STEAM AT DIEEEEENT TEINIPEEATUBES. 
Experiment 10. — Globe B. Thermometer A. December 14. 1858. 
Weight of water introduced =37’58 grains. 
Time. 
Thermometer. 
Cathetometer. 
Difference 
of level of 
columns. 
Eemarks. 
In steam. 
In oil. 
Inner column. 
Outer column. 
li m 
inches. 
inches. 
inches. 
12 45 
285 
316 
19-30 
2 15 
285 
304 
30-20 
22-63 
7-57 
2 20 
285 
307 
30-73 
22*42 
8-31 
Probably erroneous. 
2 30 
285 
330 
30-20 
22-64 
7-56 
2 40 
285 
325 
29-53 
23-01 
6-52 
Summary of Column Determinations. 
Thermo- 
meter, 
Fahr. 
Catheto- 
meter, 
inner 
column. 
Difference 
of level of 
columns. 
Humber of 
determi- 
nations 
averaged. 
Temperature, 
corrected 
for 
pressure. 
Capacity 
of globe, 
in grains 
of water 
at .39°T. 
Difference 
of level of 
columns, 
corrected 
to 32°. 
Eise of 
column from ! 
point of 1 
maximum i 
descent. 
Max. desc. 
285° 
inches. 
24-33 ? 
29-98 
inches. 
2-50? 
7-21 
4 
284.-16 
18930 
1887.2 
inches. 
2-45 ? 
7-04 
inches. 
4-59 
After obtaining these determinations, and whilst the experiment was incomplete, the 
oil-bath cracked at the bottom and stayed further progress. In consequence of having 
these vessels so deep, difficulty was found in getting them blown, and we had to be con- 
tent with such as could be obtained. These were very thick at the bottom, where the 
heat was greatest and danger most to be apprehended, and in consequence at the higher 
pressures they became a fertile source of annoyance. 
Pressure of saturated 
steam, 
in inches of mercury. 
Pressure of steam 
in globe, 
in inches of mercury. 
Specific volume of steam 
in globe, corrected for ■ 
expansion of glass. 
107-17 
102-58 
514-98 
503-60 
