CLIMATE AND PLAXT GKOWTH. 



19 



the mountings were self-contained as devised by Shive.^ Distilled 

 "water was used, but in order further to insure accurate and compar- 

 able readings, the spheres, after a month of exposure, were replaced 

 by restandardized spheres. 



In measuring the evaporation from a free water surface a gal- 

 vanized-iron evaporating pan, 10 by 36 inches, of the Weather Bureau 

 pattern, was used. The evaporation from this free water surface 



































































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/ 2 3 4 s 6 7 e e lo // /-z /3 /4 /s /& /7 /e /a 20 z/ 22 23 2-* zs ze 27 za 29 30 3/ 



y^UGUST isie 



Whifie sphere 



Free uvater sunface 



— — Average dai/y wind i/e/ocify 



Fig. 7. — EvaporatioD from white sphere and from free water surface compared with 

 average daily wind velocity. 



was recorded by means of a hook gauge, reading in hundredths of 

 an inch. 



In order that the evaporation records obtained from the two t3'pes 

 of instruments used might be compared directly, the porous spheres 

 and the free water surface were placed at the same height, namely, 

 2J feet above the ground. 



^ Shive, John W., An improved nonabsorbing porous cup atmometer. Plant World, 

 vol. 18, No. 2:7-10. 1915. 



