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 277
wasless than 18 or ^0 ft. per second, a speed insufficient for the flyingof kites. Ordinarily either kites or the kite-balloon are used;but on international days free balloons are sent up, eitherwith or without observers. The latter are used in a specialmanner that has been gradually evolved as the… … SCIENTIFIC BALLOONING. 257 Observatoire cle la Meteorologie dynamique. Balloons areused, made of the lightest silk, cambric or paper, varnished withrubber solution or linseed oil; their capacities vary from 1,000to 17,500 cubic feet. The weight of the instruments is verysmall, and therefore the…
Aeronautics
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