VELOCITY OF POLYMORPHIC CHANGES BETWEEN SOLIDS. 



67 



line running nearly linearly from 153.7° at 1 kgm. to 207.1° at 6000 

 kgm. This substance seems to be normal in every way, and the meas- 

 urements on it are as satisfactory as any. The transition accelerations 

 are shown in Figure 1 1 ; the velocity is always greater from above and 



.0,10 



.O36 



9i 



i- 



I 



.032> 



Pressure, kgm./cm.^ x 10' 

 Camphor 



Figure g.ff Camphor. The pressure acceleration of the velocity of transi- 

 tion at zero velocity as a function of pressure along the transition hue between 

 the modifications 11 and III. 



1800 



1400 



^1000 



600 



o 



5 



5 6 7 8 9 10 

 Pressure, kgm. /cm. ^ x 

 Camphor 



11 

 10' 



12 



Figure 10. Camphor. The breadth of the band of indifference between 

 the modifications II and III as a function of pressure along the transition line. 



decreases with rising pressure. The band of indifference was inappreci- 

 able in width at the two lower points, but at 5500 suddenly jumped to 

 90 kgm. 



