661 



Mr. J. S. G. Thomas on the 



# = 289 2 * 567 , where C is the heating current measured in 

 amperes. The corresponding relation in the case of the 

 thicker wires (diameter 0'202 mm.) is 6>=12'80 3 ' 08 . 



150 200 



Deflection 



The experimental values given 



in the tenth column of 

 Table IV. for the respective values of the mean impressed 

 velocity V OT of the air-stream at which the resistance of 



