CAPACITY FOR HEAT OF METALS AT LOW TEMPERATURES. 
327 
temperature on the gas scale at which the values of the specific heat were determined, 
but the value of 3 (t)/d ( pt ) at each temperature. 
For this purpose it was more convenient to work with the curve representing the 
relation between and in case any revision should be necessary in future, 
we have inserted below a table of the values of 3 (t )/3 (pt) used in the reduction of 
our observations. 
Table II. 
pt°. 
t-pt. 
3 ( 0/3 (pt)- 
o 
o 
Cl 
1 
0-33 
0-980 
o 
o 
1 
0-78 
0-974 
1 
o* 
o 
o 
1-38 
0-967 
o 
00 
1 
2'12 
0-960 
-100° 
2-98 
0 ■ 952 
- 120° 
4-00 
0-944 
- 140° 
5-21 
0-934 
-160° 
6-62 
0-924 
o 
o 
00 
r-H 
1 
8-27 
0*912 
- 190° 
9-17 
0-906 
(5) Details of the Standardisation of the Thermometers. 
Four thermometers were standardised at the same time ; thermometer A A was used 
in the preliminary experiments, Q in the final determinations, while AB and CD were 
used in subsidiary work with the ice calorimeter. 
At 0° C., 100° C., and 444°'6 C. (boiling-point of sulphur), the standardisations were 
performed with the customary form of apparatus and the results call for no remark. 
For the low temperature point —182°'97 C. (boiling-point of liquid oxygen), a two- 
litre vacuum flask was filled with commercial liquid oxygen. The thermometer bulbs 
were well immersed in the liquid and the mouth of the flask lightly stoppered with 
cotton wool. 
