Number of the dilatometer The dilatometer < 
jin S Weight in gr. of the mercury 
s that has flowed out at 18°.0 
White tin—Pentane 
Grey tin—Pentane 
71.7131 
58.9744 
72.2318 
12. The calculation of the experiments may be summarized here 
s follows: if we call: 
Pd the weight of the diamond used; 
pip 
i8°.o the weight of the pentane at 18°.0 in the dilatometer I with 
the diamond; 
^8°.o the weight of the pentane, in the dilatometer V at 18'.0; 
Up the weight of the mercury which has flowed out during the 
heating of dilatometer V (filled with pentane) from — f to 18°.0; 
5i8°o the specific gravity of mercury at 18°.0; 
^i8°.o the weight of the water that is expelled by the diamond 
at 18.°0. 
I^o 
the density of water at 18. c 0; 
d the mean coefficient of expansion of the (Jena) glass used from 18° 
to — f. 
Ud the weight of the mercury which has flowed from dilatometer I, 
when it is heated from — f to 18°.0, then the specific gravity 
of diamond at — f is 
&_,*>=- 
pj* u W d 0 u 
+ (, -<f(t + 18°))- 
^ 18°.0 ^ 18°.0 ^ 8°.0 5 18°.0 
Table 10 has been calculated by means of this expression (resp- 
by means of the analogous expressions for the other substances 
investigated. 
