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
err Hofman of Berlin,who uses the kinetic energy generated by the fall to start hismachine. It is built on legs or stilts. When ready to start, thelegs are laid against the body, and the wings folded together in the FLYING MACHINES. 105 middle. Just before the flight begins, the wings are unfolded… … 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…
Aeronautics
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