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 56
t rather partakeof the nature of wave motion. A balloon which is in a stateof equilibrium usually follows a path of this sort. Under suchcircumstances one would merely be wasting ballast if it werethrown overboard to counteract a fall; with a little patience, itwould soon be found that the balloon… … Fig. 17.—The statoscope, byGradenwitz. 36 A1KSHIPS PAST AND PRESENT.
Aeronautics
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