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Books Books 1 - 3 of 3 on In the course of 25 to 30 minutes he lowers the oxygen content of the air in this....
" In the course of 25 to 30 minutes he lowers the oxygen content of the air in this tank to 8 or 7 per cent, which is equivalent to attaining altitudes of 25,000 to 28,000 feet. Another method of attaining the same result is by means of the diluting apparatus,... "
Air Service Medical Manual ... - Page 25
by United States. Office of the Chief of Air Corps (War Dept.) - 1918 - 38 pages
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Air Service Medical: War Department. Air Service. Division of Military ...

Aeronautics, Military - 1919 - 446 pages
...of a pilot physically and mentally adapted for high-altitude work it is possible to use one who is adapted only for low-altitude work by equipping him...altitude at which the aviator would fail were he in the air. This determination is made on the ground, without danger either to the aviator or to his machine,...
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Air Service Medical: War Department. Air Service. Division of Military ...

Aeronautics, Military - 1919 - 446 pages
...bag was the prototype of the rebreathing apparatus which has been developed in the Medical Eesearch Laboratory and perfected for such tests. By means...altitude at which the aviator would fail were he in the air. This determination is made on the ground, without danger either to the aviator or to his machine,...
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Transactions, Volume 38, Issue 1

Electric engineering - 1919
...supplies directly to a mask over the face a mixture of air and nitrogen in whatever proportion is desired. All of these tests have been standardized and confirmed...comparison of the percentage of oxygen to which the flier succumbs when on the low-oxygen test, it is possible to determine the altitude at which he would...
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