CARNEGIE INST. WASH PUB 40O^FOLSE 
PLATE 8 
WIND vki.ch [TV IN MILES PER HOUR 
10 12 14 16 
-1.4 -1.8 —1.2 —1.1 —1.0 —0.9 —0.8 -0.7 -0.6 -0.5 -0.4 — (1.3 —0.2 -0.1 0.0 +0.1 +0.2 +0.3 +0.4 
—24 
4 
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+ 20 
1 
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+ IK 
+ 12 
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le 
+ 8 
+ 4 
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, 
FIRST AND SECOND DIFFERENCES OF 
MEAN e 
First difference 
Second difference 
+0.4 +0.5 +0.G +0.7 +11,8 +0.9 +l.fl +1.1 M.2 +1.3 +1.4 
Mean I 
Evaporation Curves. First and Second Differences of j^ ean e - 
THE COLUMBIA PLANOQRAPH CO., WASMINQTON. O. C. 
