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 111
ionwith the help of such contrivances as are carried on board. Twoforces are therefore needed ; the one to overcome the force ofgravity, and the other to deal with the resistance of the wind.The oldest of these aerodynamic airships were worked by meansof contrivances of the nature of wings. The… … FlG-. 46.—Degens flying machine. nature have already been described. In 1784 Gerard constructeda flying bird ; the wings were moved by mechanical devices,hidden in a box, but the details of his arrangement are notknown. A man, named Meerwein, wrote a book in which hecarefully investigated the…
Aeronautics
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