206 
ME. W. FAIEBAIEX AXD ME. T. TATE OX THE DEXSITY 
Experiment 14. — Globe A. Thermometer A. Apiil 6, 1859. 
Weight of water introduced =41-069 grains. 
Time. 
Thermometer. 
Cathetometer. 
Difference 
of level of 
columns. 
Eemarks. ! 
1 
1 
In steam. 
In oil. 
Inner column. Outer column. 
h m 
inches. 
inches. 
inches. 
1 
2 10 
297 
348 
31-88 
19-40 
12-48 
Premature. 
2 15 
297 
31-78 
19-38 
12-40 
Premature. 
2 18 
297 
31 50 
19-40 
12-10 
2 20 
297 
31-64 
19-38 
12-26 
2 22 
297 
31-60 
19-38 
12-22 
2 24 
297 
31*79 
19-30 
12-49 
2 28 
297 
31-50 
19-35 
12-15 
2 30 
297 
31-38 
19-50 
11-88 
2 45 
297 
31-25 
19-59 
11-66 
Summary of Column Determinations. 
Thermometer, 
Pahr. 
Cathetometer, 
inner column. 
Difference 
of level of 
columns. 
Humber 
of deter- 
minations 
averaged. 
Temperature, 
corrected for 
pressure. 
Capacity 
of globe, in 
grains of 
water at 
39°-l. 
Difference 
of level of 
columns, 
corrected 
to 32°. 
Else of 
column from 
point of 
maximum 
descent 
O 
inches. 
23-30 
inches. 
O 
18414 
inches. 
1-5 
inches. 
297 
31-52 
12-11 
7 
295-93 
18011-2 
11-79 
10-29 
This experiment was arrested whilst incomplete by the breaking of the thermometer. 
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. 
449-62 
439-85 
128-40 
118-11 
Beduction of the preceding Experiments. 
The inner column of mercury having attained its maximum point of descent, remains 
stationary so long as vaporization is going on in both vessels, and then the temperature 
at which the first decided indication of ascent of the inner column is observed, obnonsly 
gives us the maximum temperature of saturation. Tims, for example, in Experiment 2, 
we should at once fix this temperature at, or nearly at, 244°- 71; for at this temperature 
the inner column of mercury stands about half an inch above the level corresponding to 
saturation pressiue, the differences of level at less temperatures being too small to war- 
rant us in taking them as indications of superheating. But as slight oscillations in this 
column, arising from accidental changes of temperature or from other causes, might lead 
us to infer that the steam had arrived at its maximum temperature of saturation before 
it had actually attained this point, we considered that there would be less chance of 
