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 207
ed to help the landing operations, but it isof course practically useless if the ground is rocky or frozen. Thedesigns for grapnels are very numerous ; all, doubtless, aremade with the intention of improving the grip under unfavour-able conditions. The shocks which a balloonsustains from bumping on…
Aeronautics
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