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 297
6 AIRSHIPS PAST AND PRESENT. out large quantities of ballast continually, in amounts varyingfrom 130 lb. to 330 lb. Then when a position of equilibriumwas reached, a complete series of observations would be takenafter which more ballast would be thrown out. Besides the ordinary readings on the… … Fig. 176.—The balloon, Prussia, half full of gas. we had risen to a height of 26,000 ft., and in four hours wereached an altitude of 29,500 ft., and soon after we eclipsed therecord, which till then had stood at 30,000 ft. This height hadbeen reached on December 4th, 1894. The pressure was nowless…
Aeronautics
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