1801.] 



On Electrical Evaporation. 



95 



The difference between the amount of cadmium driven from the 

 two poles having proved to be so decided, another experiment was 

 tried in a tube so arranged that the metal could be more easily 

 weighed before and after the experiment. The apparatus is shown 

 in fig. 7. A tube was blown (J -shaped, having a bulb in each limb. 



FIG 7. 



The platinum poles were, as before, at the extremities of each limb, 

 and in each bulb was suspended from a small platinum hook a small 

 lump of cadmium, the metal having been cast on to the wire. The 

 wires were each weighed with and without the cadmium. The tube 

 was exhausted, and the lower half of the tube was enclosed in a metal 

 pot containing paraffin wax, the temperature being kept at 230 C. 



