Am. Jour. Sci., Vol. XLVII, II 



Plate III 



I2 h IO"'PM ll™ TS m I3 m 



Wind velocities recorded February 4, 1893, at the Smithsonian Institution, with 

 a light Robinson anemometer (paper cups) registering every revolution. 

 Abscissae = Time. 

 Ordinates — "Wind velocities in miles per hour. 



