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 136
mpression of the air suffices to lift it upwards. All these ex-periments tend to show that the crux of the problem lies largelyin the creation of sufficient kinetic energy to give the machine astart. For the sake of completeness, two other types ought tobe mentioned, viz., the paddle-wheel and the… … Fig-. 67.—Wellners flying machine. sails on the surfaces of revolving drums, and thereby causingthem both to support and propel the load. Even if the reports from America about the Wrights arelargely discounted, it is quite certain that substantial progresshas been made of late years in the design…
Aeronautics
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