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 129
ll so long as the sails were small, but he was driven to increasetheir size. He therefore made an apparatus, which had a sailboth on the left and on the right; the area of each was 97 squarefeet, and the span from tip to tip was 18 ft. In this case, theold method of shifting the position of the… … Fig-. 62.—Lilienthal starting from the hill on his flying machine. heights, and to float over the spot from which he had started,if the speed of the wind was greater than 30 ft. per second.In order to land in a gentle breeze, the machine was pointedupwards by allowing the body to fall backwards.…
Aeronautics
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