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 147
es on the surface of the parachute of0*2, 0*4, 0*8, 1*6 and 3*2 lbs. per sq. ft. respectively, thecorrespondingly final velocities will be 7*87, 11 5, 164, 226, and328 feet per second. It is very important to provide a smallopening at the top of the parachute, so that the compressed air 126…
Aeronautics
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