PLATE III 



12 h 10" , PM 11™ l2 m IS™ J4-" 15" 16 m X7 n 



Wind velocities recorded February 4, 1893, at the Smithsonian Institution with a light Robinson anemometer 



iper cups) registering every revolution. 



Abscissae = Time. 



Ordinate's = Wind velocities in miles per hour. 



