he velocity being at one moment perhaps 40miles an hour, then diminishing to an almost instantaneous calm,and then resuming.* The fact that an absolute local calm can momentarily occurduring the prevalence of a high wind, was vividly impressedupon me during the observations of February 4th, when… … :brua/y 4,1893, at the Smithsonian Institution with a light Robinson(paper cups) registering every revolution.Abscissa: = Time.Ordinatcs = Wind velocities in miles per hour. 78 AIRCRAFT April, igio CHURCH AEROPLANE COMPANY BROOKLYN, N. Y. Heavier-Than-Air MachinesSeparate PartsWorking ModelsFlying…
Aeronautics
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