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 209
e.It is therefore joined to boththe hemispherical and cylin-drical portions, and forms asort of inner envelope, leaving,however, a space between thetwo, into which the air can bedriven by the wind. In thisstate the balloon must be sup-posed to be fully inflated. Assoon as it rises, the gasexpands,… … Fig. 115a.—The kite-balloon designedby Major von Parseval and Majorvon Sigsfeld. BALLOON CONSTBUCTION, ETC, 189 adjustment of this rope is therefore a matter of great importance.As soon as the volume of the balloon begins to contract, air entersthrough an opening into the air-bag, and the valve…
Aeronautics
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