[edson-mcintosh] preparation OF METALLIC VANADIUM 



83 



admitted slowly through B. The "fillet" is made to glow by passing 

 a current controlled by resistance through it. The vanadium de- 

 posits smoothly on the platinum as a silvery-grey coating. The wire 

 before and after an experiment is shown in Fig. 2. 



Fig 2. 



The experiment may be carried out either in vacuo or in an at- 

 mosphere of hydrogen at low pressure. As soon as the filament 

 reaches a white heat the deposition begins and can be continued until 

 the wire burns out. The vanadyl chloride passing through A can 

 be condensed in a tube cooled by solid carbon dioxide and ether. 



This method, while inapplicable for the preparation of vanadium 

 on a large scale, may be used with advantage in the laboratory, or for 

 demonstration in the lecture room. 



McGill University, May 1915. 



