the Thermometric Anemometer 



697 



2° C. between the two thermometers would under these 

 circumstances correspond to m greater rise of temperature 

 than 2° 0. in the stream. This effect is shown in fig. 3. 



04 



0-3 



UJ 



a 

 o. 



UJ 



h- 

 u. 

 O 



UJ 



u 



OJ 



C£ 



UJ 

 Q- 



Q 



UJ 



eu 

 n. 



« Oi 

 tn 



>- 



! 



i 









■ 1 



DISTANCE BETWEEN 

 FIRST THERMOMETER 

 AND HEATING COIL 



50 CMS 

 X 0-8 CM. 







; i 





J?f 



//" 



\y 



1 __l L_ 



L_ _J 1 



Fig. 3. 



1 1 v 



i _i — i — i 



O 4 8 12 16 



VELOCITY(CMS. PER SEC, VOLUMES REDUCED TO 0°CAND76CWf1.), 



Both curves were obtained with the second thermometer at 

 a distance of! 0*8 cm. from the heating element. The 

 respective distances of the first thermometer therefrom were 

 30 cm. (curve A) and 0*8 cm. (curve B). 



Summary, 



An experimental investigation of the application of the 

 thermometric anemometer to the determination of slow rates 

 of flow of gases is detailed. It is shown that values of such 

 low velocities cannot, in general, be uniquely determined by 

 such type of anemometer. Thi«* arises ou ing to the existence 

 of a minimum value of the energy supply required to heat 



