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 126
Fig. 58.—Hofmanns first model with carbonic acid motor. because the sails are carried in a horizontal position. The legsare then jerked up against the body, and the whole thing beginsto fall. In doing so, it turns over so that the sails are no longerparallel to the ground, while the motor continues… … Fig. 59.—Hofmanns working model. forwards. But this upward movement is only intended to lastan instant. The wings soon get into such a position that theyare able to take the whole load, and as the machine movesforward, fresh quantities of air are successively compressed 106 AIRSHIPS PAST AND…
Aeronautics
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