The Kata-thermometer as a Measure of Ventilation. 205 



The Kaia-thermometer in Practical Use as an Anemometer. 



To test the accuracy of the wind formulae for practical purposes, series of 

 experiments have been carried out at Kew Observatory, where observations 

 were taken by kind permission of Dr. Chree ; at High Beech, Loughton ; at 

 Walberswick, by Mr. P. F. Alexander ; and at Eskdalemuir, by Mr. P. N. 

 Shelton, under the direction of Mr. L. F. Richardson. The results are shown 

 in the Table. It will be seen that in all cases the wind as determined by the 

 "kata" agrees well with that given by other anemometers. 



Place oi 

 observation. 



H. 



6= (36 -5-i!). 



Velocity 

 " kata." 



Cup 

 anemometer. 



Kew 

 anemometer. 



Eskdalemuir 

 air meter. 



lime of 

 observation. 

















mins. 



r 



24 -2 



17 '5 



7-n 



6 -4"! 



6-01 



— 



8 





21 -5 



18 -0 



5-1 | 



5 ' 7 * 



6 -0 | 



' — 



3 



Kew <| 



21 9 



18-0 



5-4^5-8 



5-5 \-5-7 



6-3 |-5 -9 



— 



5 



: 



22 9 



17 -9 



6-0 | 



5 '5 i 



4-9 | 



— 



7 



I 



21 -9 



17 -9 



5 '6 J 



5-7J 



6-0J 



— 



7 





25 -1 



22 -0 



4-71 



4'9~) 



— 



— 



5 





27-0 



22 



5-5 | 



5-7 | 



— 



— 



10 



High Beecli • 



25 -5 



22 -2 



4-7 f-5'4 



5-5 J-5-6 



— 



— 



10 





27 -3 



21 -5 



5-9 | 



5-4 | 



— 



— 



6 



| H >iJ v. 



28 6 



22 -0 



6-2J 



6 -5 J 







6 



f 



35 "5 



33 '2 



4 '0 



4 '0 









35 5 



33 2 



4-0 



4-4 











48-0 



37 -3 



6-1 



5-3 











33-1 



37 -6 



2-5 



2-8 











45-1 



37 -5 



5 -2 



5-0 









Walberswick - 



55 -5 



37 6 



8 3 



7-5 











40-4 



37 1 



4-2 



4-6 











32 5 



34 -6 



3-0 



3-0 











29 -0 



28-2 



3 7 



4-1 











32 -0 



30 -4 



3-8 



4-2 











29 -4 



29 -6 



3-3 



3 5 











23 2 



33 -6 



1 3 







2-1 







34 -6 



33 -8 



3-6 







2-9 







27 -7 



33-1 



2-2 







2-4 







24 -2 



33-1 



16 







1-7 







22-5 



30 3 



1 -7 







0-7 





Eskdalemuir < 



40-1 



35 -8 



4-4 







4-7 





i 



26-8 



32 8 



2-2 







2 -3 







35 -8 



29 -5 



5-3 







5-2 







31 -5 



33 -2 



3-0 







2 -5 







26-7 



32 7 



2-2 







2 2 







36 -8 



30 -6 



5 2 







3'5 





I 



28 -0 



31 -6 



2-6 







2-4 





Summary. 



From the above considerations then we consider that we are justified in 

 saying that the "kata" is an instrument which shows a definite relation 



