Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon . is pressure, rabbits were killed in1J hours, but pigeonsmanaged to survive,though they tumbledabout helplessly on theground. Schroettermade careful observa-tions on the pulse, rateof breathing, etc., andreports as follows: Wewere now surroundedby an atmosphere at apressure of 11*8 the mercury wassinking, we noticed afeeling of lethargy,against which we strug-gled by breathing ashard as we could. Butthis did not help faces became verypal
Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon . is pressure, rabbits were killed in1J hours, but pigeonsmanaged to survive,though they tumbledabout helplessly on theground. Schroettermade careful observa-tions on the pulse, rateof breathing, etc., andreports as follows: Wewere now surroundedby an atmosphere at apressure of 11*8 the mercury wassinking, we noticed afeeling of lethargy,against which we strug-gled by breathing ashard as we could. Butthis did not help faces became verypale with a somewhat livid colour; our heads were drowsy, ourlegs trembled, our hands lost all power, and gradually welapsed into a state bordering on unconsciousness. We breatheda little oxygen out of the receivers, and felt at once the distressing symptoms disappeared, and we seemed oncemore to be in full possession of bodily and mental pressure gradually sank still further; but as we continuedto breathe oxygen, I was able to continue my observations onthe pulse, reflex actions, dynamometer, etc. The pressure. Fig. 172.—Professor Siiring, of the PrussianMeteorological Institute. SCIENTIFIC BALLOONING. 273 fell below 1025 in., which corresponds to a height of 28,000 ft. ;the observations were then concluded, and it was possible, evenat this pressure, to smoke a cigarette. Sehroetter is satisfiedthat the balloonist is liable to be attacked by all the symptomsof mountain sickness. A sleepy, lethargic state is induced, andthe simplest thing requires a great effort. To stand up or tobend the body becomes a very exhausting operation. The musclesdo not remain under control; both sight and hearing are affected,and the mere effort of thinking is wearisome.
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