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 252
ffwind the dangers of being dragged and bumped along the groundare much smaller if the envelope is suddenly emptied of its gas.A landing normally takes place somewhat as follows.1 As soonas it is determined to make the descent a suitable spot is selected,partly by consulting the map, and partly by… … Fig. 142.—Landing in a tree. place at the rate of 8 or 10 ft. per second; therefore, if thehorizontal velocity is known, as also the distance of the point ofdescent, it is easy to fix the level at which the valve must beopened. The rate of falling is about 6 miles an hour, and letus suppose that…
Aeronautics
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