650 



Mr. J. S. Gr. Thomas on the 

 The former shows how the resistance of each 



and fig. 3. 



wire of the pair depends upon the impressed velocity of 



the air-stream in the case of wires of diameter 0"101 mm. 



075 





10 2o 30 40 



Velocity, (cms. per sec. volumes reduced to o°c & 76om.m.) 



Fig. 3 shows the corresponding results for wires of dia- 

 meter 0*202 mm. In each case, results are given for wires 

 mounted both vertically or both horizontally, ihe experi- 

 •mental points in each case corresponding with those given 

 in fig. 1. The main features of the curves shown in fig. 2 



