440 Prof. L. Hill and Mr. D. Hargood-Ash. 



observations were taken on the roof of Kew Observatory. The day was 



one with a steady strong breeze : — 



Table 1. 



Time. 



Wind velocities (metres per sec.). 



j G.M.T. 



Cup anemometer. 



Pressure tube. 



£ata. 



x40-x 50 



6-0 



6-5 



6-4 



X 55— xi 5 



6-5 



6-25 



6-6 



xi 10 -xi 20 



6-0 



51 



5-2 



xi20-xi30 



6-4 



•T "7 



6-3 



re 



Wind VeI-OCI— V; METRES PER SECOND. 



The cup anemometer is regarded as the more accurate instrument. The 

 agreement with the readings of the cup anemometer is close enough to 

 establish the claim that the kata-thermometer is an accurate anemometer. 



