Directional Rot-Wire Anemometer. 



647 



it may be remarked that when the wires are installed 

 vertically, they are each laved by their respective free 



ZOO 2>00 



Deflection. 



convection currents, and as shown in Table I. the wires, 

 in the absence of any flow, are at a considerably higher 

 temperature than that to which they are raised when 

 used horizontally and heated by the same current. The 



