Phil. Mao-. S. 5. Vol. 37. PL VII. 



12 I0'"PM li*" 



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. 



