Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon . only 11° F. Theinhaling of oxygen produced under these conditions very greatrelief. They continued their experiments, but unfortunatelywith fatal results. On April 15th, 1875, Gaston Tissandier,Sivel and Croce-Spinelli made an ascent with the intention ofreaching still greater heights than Glaisher had done. Theytherefore took with them small balloons, which contained amixture of oxygen and air. These balloons were fitted withtubes, through which the gas
Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon . only 11° F. Theinhaling of oxygen produced under these conditions very greatrelief. They continued their experiments, but unfortunatelywith fatal results. On April 15th, 1875, Gaston Tissandier,Sivel and Croce-Spinelli made an ascent with the intention ofreaching still greater heights than Glaisher had done. Theytherefore took with them small balloons, which contained amixture of oxygen and air. These balloons were fitted withtubes, through which the gas might be inhaled as occasionrequired. Sivel was the first to be attacked by a fainting fit, SCIENTIFIC BALLOONING. 269 which, however, quickly passed off. Tissandier meanwhilecontinued meteorological and physiological observations withoutinterruption. His pulse made 110 beats in the minute at aheight of 13,000 ft., while it made 80 under normal conditions;at 17,500 ft. Sivels pulse was beating at the rate of 150 perminute, and Croces at 120, and the rate of breathing increasedin much the same proportion. At 23,000 ft. their strength. Fig. 169.—Baro-thermo-hygrograph, designed for balloons with observersby Dr. Hergesell, and made by Bosch, of Strassburg. (From Die Umschau.) began to fail, and they fell into the usual listless hands became stiff from the severe cold, and they wereattacked by giddiness and fainting fits. Sivel and Croce satmotionless on the bottom of the basket, but Tissandier was ableto see from the barometer that they had reached a height of26,000 ft., and then also became unconscious. After some timehe was aroused by Croce, who suggested that some ballast shouldbe thrown out, as the balloon was falling rapidly. But Crocehad to do it himself, as Tissandier again lost consciousness. 270 AIESHIPS PAST AND PEE SENT. After a while Tissandier recovered his senses, but he was unableto arouse his companions, who had been suffocated in the mean-time.
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