Haughton and Eeynolds — "Drag'' of Air upon Air. 279 



T = 1-51 Minute. 

 Details of Experiments on Air. 

 1. 2Sth May, 1879 :— 





n = vibrations, 



= amplitude 



Hour. 



number of 



of 





complete. 



■whole arc. 



9 A.M. 



oo^-o 



iso^-o 



10 „ 



39 -8 



99 -0 



11 ,, 



79 -5 



68 -0 



Noon, 



119 -2 



56 -5 



1 P.M. 



159 -0 



43 -5 



\ 



From these data I find — 



Pirst hour, /= 1 v 6626 



T^vo hours, ,, 5564 



Three ,, „ 6487 



Four ,, „ 6590 



Mean of all, / = . 



' -^ 6317 



2. 30th May, 1879:— 



Hour. 



« 











oo°-o 



92°-00 



1 



39-8 



68 -70 



2 



79-5 



50 -20 



3 



119 -2 



38 -90 



4 



159 -0 



30 -50 



5 



198-7 



22 -00 



6 



238 -4 



16 -85 



7 



278 -2 



12-75 



Prom these data I find — 



One hour, /= 1 



Two hours. 



Three 



Four 



Five 



Six 



Seven 



Mean of all, 



/ = 



1 



-f6191 





5952 





6278 





6532 





6299 





6735 





6384 





1 



6339 



