Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon . ng to inhale it. Bert showedthat one-third of a cubic foot of air mixed with oxygen, andcontaining 70 per cent, of oxygen, is required per minute up toa height of 23,000 ft., but for heights above this pure oxygen isnecessary. Therefore Croce-Spinelli and Sivel ought to havetaken 46 cubic feet of air mixed with oxygen, and 64 cubic feetof pure oxygen, and it is certain that their stock was nothinglike this. SCIENTIFIC BALLOONING. 275 All preparations had
Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon . ng to inhale it. Bert showedthat one-third of a cubic foot of air mixed with oxygen, andcontaining 70 per cent, of oxygen, is required per minute up toa height of 23,000 ft., but for heights above this pure oxygen isnecessary. Therefore Croce-Spinelli and Sivel ought to havetaken 46 cubic feet of air mixed with oxygen, and 64 cubic feetof pure oxygen, and it is certain that their stock was nothinglike this. SCIENTIFIC BALLOONING. 275 All preparations had been carefully made when Berson andSuring started on their record-breaking journey on July 31st,1901. They rose to a height of 35,400 ft., and calculated before-hand from theoretical considerations that human life was impos-sible at a height of 36,100 ft. Siirings description of the ascentis as follows:— At the balloon Prussia began toascend. It had a capacity of 190,000 cubic feet, and had beenfilled with hydrogen. It carried about 3J tons of sand and ironfilings as ballast, and rose very gently in the air under a slight. Fig-. 175.—Herr von Schroetters handwriting under an atmospheric pressure of945 inches of mercury. (Photograph from Zuntz Hohenklima und Bergwanderungen.) north-west wind, the sky being partially covered with cirrus andcumulus. The balloon was rather more than half full and rosequickly but steadily; in 40 minutes it had reached a height of16,000 ft., and at this stage it had assumed a spherical had with us four cylinders of compressed oxygen, each hold-ing 35 cubic feet. Soon we began to turn to the right, and ourcourse was directed somewhat towards the south of the start the temperature had been 74° F. ; it hadnow sunk to 19° F. We began to inhale oxygen at a heightbetween 16,000 and 20,000 ft., but rather as a precaution andwith a view to saving our strength than from any actual neces-sity. The balloon seemed to be
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