United States. National Advisory Committee for Aeronautics, United States. National Aeronautics and Space Administration · Washington : G.P.O. · leaf 664
mmetrical motions are easier than the unsymmetrical to deal with,because in a symmetrical motion all points along a line perpendicular to the plane of S3^mmetryhave the same speed and direction of motion, and it is therefore only necessary, in general, totake readings at one point, whereas in… … 0 Fig. 1.—The Vane and Air Speed Meter,
Aeronautics
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