United States. Army Division of Military Aeronautics · leaf 108
12 FUNCTION OF THE GAS, The gas in the envelope always tends to rise^ hence it is possible to leave the mouth or appendix at the base of the balloon open without the gas escaping. The gas can only be let off at the top, and for this reason the … pounds itself it has a lifting power of 70 pounds. One cubic foot of hydrogen, therefore, has a lifting power of about 1y^ ounces. To gather a clear idea of the function of the gas in a balloon, you may think of the hydrogen in cubic feet D piled one on the other, each trying to rise under a 1…
Balloons · Aeronautics, Military
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
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