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 278
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… … Fig. 160.—Ascent of a balloon, fitted with a parachute, at Lindenberg. very light construction ; it has merely to resist the internalpressure and carry the basket containing the instruments.Assmann has designed an arrangement whereby an alarumclock opens the valve after a certain time, and…
Aeronautics
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