Ferris, Richard. [from old catalog] · New York, T. Nelson and sons · leaf 26
the earth may be gained byrecalling that the pressure of the 38 miles of atmos-phere is just equal to balancing a column of water33 feet high. The pressure of the air, therefore, isequivalent to the pressure of a flood of water 33 feetdeep. But air is seldom dry. It is almost always min-gled with… … Apparatus to show effects of heat on air currents, a, alcohol lamp;b, ice. The arrows show direction of currents. Another fact very important to the aeronaut isthat the air is in constant motion. Owing to itsready expansion by heat, a body of air occupying one 26 THE AIR. cubic foot when at a…
Aeronautics
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