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 52
lowing the gas in the cylinder to expand, itwill be necessary to load it with a weight of 14*7 lbs. If the pistonis loaded with a weight of 29*4 lbs., the volume of the gas will be THE THEORY OF THE BALLOON. 31 reduced by one half ; the pressure of the gas will therefore bedoubled, and its density… … Fig. 16. -Stockholm, seen from a height of 1,600 feet. Photograph by OskarHalldin. lift which acts on a balloon at different heights, or withdifferent atmospheric pressures. Let us suppose that the baro-metric pressure is that of 30 in. of mercury, and that the liftis 1,600 lbs. If the pressure…
Aeronautics
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