438 Mrs. K. Strajton and Prof. J. P. Partington on 



the substance in the vessel A (see figs. 1 and 2) . The outer 

 enamelled pot was fitted with a cardboard top, the card- 

 board | of an inch thick, through which the inner vessel 



Fur. 2. 



C = Cork- 

 5= Space. 

 CB=Card board, 



could be suspended in the molten substance in B. The card- 

 board was cut to allow the passage of a thermometer into 

 the bath, this again acting as a temperature recorder and 

 stirrer. 



The heating coil was made in the following way : — A piece 

 of ebonite rod, 3 cms. in length, 0*75 cm. in diameter, was 

 taken, and a small hole drilled through its length. A small 

 hole was also drilled from side to side at one end (see fig. 3) ; 



Fio-. 3. 



i 



Eureka wire. 

 Cu Leads. 



a thin groove was turned on the rod to keep the coiled wire 

 in position. One end of the Eureka wire of 0'3 mm. 

 diameter was threaded through the hole in the top, wound 

 round the rod, then at the opposite end was drawn through 



