74 



BROOKLYN BOTANIC GARDEN MEMOIRS 





Direction 



Meaa 



Vapor 





Evaporation per 



Date 



and Velocity 

 of the Wind 



Tempern- 

 ture 



Pressure 



(inches) 



Sky 



day in c.c. 





Black 1 White 



July 













8-AM 



SW-14 



69.1 



.661 



rain \ 







8-PM 



SW-9 



71.6 



•757 



cloudy 1 







9-AM 



NE-18 



62. 



•517 



cloudy / 







9-PM 



NE-15 



66.3 



•536 



cloudy I 



24.0 



15-7 



lo-AM 



NE-16 



63.7 



•499 



cloudy ( 







lo-PM 



NE-14 



67.6 



•536 



cloudy \ 







ii-AM 



NE-20 



63.1 



•432 



cloudy I 







ii-PM 



NNE-22 



63.0 



.482 



cloudy ' 







I2-AM 



NE-16 



63.1 



•575 



rain i 







I2-PM 









rain \ 







1 3- AM 









partly cloudy 1 







13-PM 









partly cloudy 1 







14-AM 



W-9 



69.8 



.684 



clear J 







14-PM 



SW-13 



76.0 



.707 



clear 1 







15-AM 



SSW-5 



68.8 



.684 



fog ^ 



27.2 



17-7 



15-PM 



SW-12 



71.8 



•732 



fog 1 







16-AM 



SW-9 



70.8 



.707 



clear V 







16-PM 



SW-21 



74.0 



•757 



clear 1 







i7-Ai\I 



. NW-4 



75-0 



.783 



clear 1 







17-PM 



S-4 



80.5 



•783 



partly cloudy / 







1 8-AM 



SW-14 



70.0 



•732 



clear ' 







Lack of wind velocity, such as the table shows, is unprecedented for 

 Montauk, and, if the black instruments are as sensitive to wind as the 1921 

 readings appear to indicate, their low rate of evaporation during the 1922 

 period is understandable. So far do the readings of the black or white 

 instruments depart from the normal that the total evaporation from the 

 white atmometer in the open is actually exceeded by a similarly exposed 

 instrument at Coram. There the record from July 27 to August 28 totalled 

 179.4 cc. more than at Montauk! This excess at Coram is undoubtedly 

 due partly to higher temperature, as the central pine-barren region, at 

 least so far as maximum temperatures are concerned, is always consider- 

 ably warmer than Montauk. It is partly due also to the lower humidity 

 at Coram. Montauk, surrounded by water, is, in the absence of its usual 

 gales, a decidedly humid region, and during the 1922 readings, as the de- 

 tailed record shows, the wind never reached a velocity of even twenty-five 

 miles an hour. A glance at the velocities during the 1921 high readings 

 will confirm the statement there hazarded that wind velocitv and the rate 



