. Some Measurements of Atmospheric Turbulence . 6 ,the turbulivity to 200 The sky was cloudless. Obstructions to windward roseabove the horizon to an angle of only §V radian. The photograph was taken inlatitude 51° 37 N., longitude 4m. 24s. west, at 1919, Sept., 29d. 17h. 58m. Above is a table of observations. It is noticeable that when two of the direct stresses xx9 yy> hh have been measured at the same time and place, theyhave been found to be not very unequal. G. I. Taylor has published someobservations which show the same thing. It is as though there were a kind ofeq
. Some Measurements of Atmospheric Turbulence . 6 ,the turbulivity to 200 The sky was cloudless. Obstructions to windward roseabove the horizon to an angle of only §V radian. The photograph was taken inlatitude 51° 37 N., longitude 4m. 24s. west, at 1919, Sept., 29d. 17h. 58m. Above is a table of observations. It is noticeable that when two of the direct stresses xx9 yy> hh have been measured at the same time and place, theyhave been found to be not very unequal. G. I. Taylor has published someobservations which show the same thing. It is as though there were a kind ofequipartition of energy between the three components of the eddying motion. Avery marked increase in both direct stress and diffusivity takes place either withvelocity or with height. A rapid increase of viscosity with height in the first200 metres has also been deduced by W. Schmidt from wind observations made byHellmann over a piece of flat land. ( Sitz? Akad. Wien, 1917, Heft 6, p. i7)- Richardson. Phil, Trans., A, vol. 221, Plate ^^mm^^-m ? \ m i N8%.-> Wmmm ?T*:-Jft*: -: Fig.
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