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



Plate IV. 



i^hgOm aim SS t. 23 .« £4™ 25 m 86'" 37 m 3S"< 2S" 



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

 a light Hobinson anemometer (paper cups) registering everj T revolution. 

 Abscissae = Time. 

 Ordinates = Wind velocities in miles per hour- 



