PLATE II. 



50" 



l h 50 m PM SI" S2 m 53 m 54 m 55 m 56"" S7" bS 



Wind velocities recorded January 14, iSg3, at the Smithsonian Institution with a light Robinson anemometer 



(paper cups) registering every revolution. 

 Abscissas = Time. 

 Ordinate* = Wind velocities in miles per hour. 



