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 146
due to the fact that a downward windhelps to increase the speed. Professor Koeppen has collected some figures from which heconcludes that too low an estimate has generally been put onthe time occupied in falling. Robertson is said to have fallen10,000 ft. in 35 minutes, which is at the rate of 4…
Aeronautics
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