Constant- Current Type of Hot-Wire Anemometer. 731 



Finally, in fig. 6 are "given the forms of: the calibration 

 curves obtained employing a heating current of 1*3 amp. in 

 the bridge for various inclinations (specified in the diagram) 

 of the wire to the horizontal. The bridge was in every case 

 initially balanced in the absence of an impresed flow and the 

 galvanometer shunt adjusted throughout to 4 ohms. The 

 diminished influence of the free convection current upon 



200 300 



DEFLECTION. 



the form of the calibration curve as the wire is more inclined 

 to the horizontal is clearly brought out by the curves, the 

 initial steep portion of the' curves becoming continually less 

 pronounced as the inclination of the wire to the horizontal 

 is increased. Excluding these initial portions, the curves 

 are seen to be practically parallel to one another. 



