To be an aviator a man must be physically qualified, his eyesight must be normal without glasses, and his static ear must respond to the regulation tests for nystagmus, past pointing and falling. This gives us an aviator who is a perfect type of man, but is this enough?
For ordinary maneuvering close to earth the man does not require to be so finely adjusted, for he is in a medium of air almost the same in density and condition as that at the earth's surface. This does not hold true, however, for the aviator who ascends to more than a thousand feet, as when he has attained a greater altitude, he experiences varying conditions of density and temperature, which change in a direct and fixed ratio at the different levels. Were it the practice of the aviator to ascend and descend to any given altitude at a moderate rate
ROBERTSON CM. EXAMINATION OF MEN ENTERING THE AVIATION SERVICE: A NEW TEST AND METHOD OF CLASSIFICATION FOR LABYRINTH, MUSCLE TONE AND BLOOD PRESSURE FINDINGS: PRELIMINARY REPORT. JAMA. 1918;71(10):813–817. doi:https://doi.org/10.1001/jama.1918.26020360001009
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