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 128
, which were distended to represent the wings of a bird, andmade of calico, supported on a frame of wickenvork. He satwith the lower part of his arms resting on the frame ; in thisway he controlled the movements of his machine. In a strongwind, he would soar above the heads of the astonished… … Fig-. 61.—Lilienthal on his flying machine. Sudden gusts were particularly dangerous and might cause thewhole machine to turn over. He found a maximum area of 150square feet to be suitable for his sails, with a span from tip totip of 23 ft. Anything bigger than this only caused loss ofstability.…
Aeronautics
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