Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon (1908)
Hildebrandt, A. (Alfred), b. 1870, Story, W. H. tr · New York, D. Van Nostrand company · leaf 90
locities of fluids. If a glass cylinder is filledwith fluid, and rotated about a vertical axis, the upper surface ofthe fluid assumes the shape of a paraboloid of revolution, and thedepression depends, as far as its magnitude is concerned, on thespeed of rotation. If such an instrument is… … Fig. 37.—Gradenwitz anemometer. 70 AIRSHIPS PAST AND PRESENT. in the combination of a Robinson anemometer with a closedglass tube containing the fluid. The apparatus is set inmotion by the wind, in the usual way, and it is then possible bynoting the depression to tell the velocity at any instant.…
Aeronautics
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