Am. Jour. Sci., Vol. XLVII, 1894. 



Plate V. 



jyh 36 "• 37 m 38'" 39 rn 40 m 



Wind velocities observed at Smithsonian Institution, February 20, 1893, 

 with a Robinson anemometer (aluminum, cups) registering every 

 five revolutions. 



Abscissae = Time. 



Ordinates = Wind velocities in miles per hour. 



