AERONAUTICS: Stratospheric Flying

Those few flyers who have been able to get seven miles above the earth have been at the top of the earth's atmosphere layer. They have been able to stay there only a few moments, for the temperature is 75 degrees below Fahrenheit zero and the air-pressure is one-eighth of what man is built to endure. Nor could the thin air sustain the planes or sufficiently burn the fuel.

Beyond the "atmosphere" is the "stratosphere," a rarefied layer extending 25 mi. further, where it meets the Heaviside Layer of tenuous, electrified gases...

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