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 75
. In order toprevent any injury to the propeller blades when a descent wasmade it was possible to slightly raise the axis on which theywere mounted. Moreover, Eenard intended to obviate anyserious shocks on coming to earth by using a guide rope. Theway in which such a rope is used becomes evident… … Fig. 27.—Tissandiers dirigible balloon DIRIGIBLE BALLOONS FROM 1883 TO 1897. 55 result from contact with the ground. It is, however, difficult tocheck this velocity by throwing out ballast, because the throwingout of too little ballast might not be sufficient to -prevent adangerous shock, and if…
Aeronautics
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