ATJBITK. 



53 



13000 



12500 



12 000 



C '1500 

 a) 



3 



a. 

 E 



11000 



("35) 



10500 



10000 



9500 



(1000) 



Time - I division =10 minutes 



Fig. i2. Curves showing the absorption of heat in melting orthoelase. 



shows the course of the curve without the absorption, as inferred from 

 the glass curve. The same figure contains two other curves (II, III), 

 similarly obtained, which were made upon fresh charges of the same 



