356 



Mr. F. Bates on a New 



rendering it relatively soft and greatly reducing its tensile 

 strength. Subsequently it was discovered that upon dis- 

 tilling the cadmium from the alloy at a pressure of 

 O'OOI mm. of mercury, the minute quantity of gallium 

 carried through was sufficient to completely change the 

 character of the cadmium and to prevent adhesion between 

 the cadmium and the walls of the lamp. 



Fig.l 



The type of quartz lamp used in the experiments is that 

 shown in figure 1. The total volume is approximately 

 ten cubic centimetres. The electrodes consist of tungsten 

 wires (B) entering through quartz capillaries. They are 

 closed with lead seals similar to the type described by 

 Sand *. 



* Proc. Phys. Soc. London, vol. xxvi. p. 127 (1914). 



