Am. Jour. Sci., Vol. XLVII, 



Plate 



WM 



l h 4£ m P.M. 43 r 



44"> A6' 



Wind velocities recorded January 14, 1893, at the Smithsonian Institution, with a light 

 Robinson anemometer (paper cups) registering every revolution. 

 Abscissae = Time. 

 Ordinates = "Wind velocities in miles per hoiir. 



