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 49
weight of a cubicfoot of the atmosphere at a temperature of 32° Fahr. and apressure of 29*92 in. of mercury, is 0*0807 lb.; the weight of acubic foot of hydrogen under the same conditions is only0*0056 lb., and of a cubic foot of coal gas about 0*04 lb. on anaverage. The law of Archimedes therefore… … Fig. 14.—The Baroscope. hydrogen is chemically pure. In point of fact, the above figuresare slightly too high, in so far as ordinary samples of hydrogenand coal gas are concerned. But allowance must be made for the weight of the car, net,ropes, and other appurtenances, in calculating the…
Aeronautics
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