512 



PKOCEEDINGS OF THE AMERICAN ACADEMY. 



The change of volume points, obtained by the usual method of 

 observing the piston displacement at constant temperature, are given 

 in Table XXIV. and Figure 29, plotted on a very much enlarged scale. 



TABLE XXV. 



Latent Heat, etc., for the EQuiLrBRiuM Curve, Ice V-Ice VI. 



Here again the points found before February 10 with kerosene as the 

 transmitting fluid show much less regularity than the points obtained 

 afterward with gasolene. The kerosene points have been omitted from 



^ 5.G0 



bJ 5.40 



a. 



o -0.180 

 o 



4/Y 



-0.200 



-20' -15" HO' 5' 0' 



TEMPERATURE. 



Figure 30. The latent heat and the change of internal energy when V 

 passes to VI. 



the diagram. The effect may be due in part to the increased viscosity 

 of the kerosene under pressure. Within the limits of error, the rela- 

 tion between V and temperature is linear, the change becoming less 

 at lower temperatures as one would expect. 



