402 REPORT NATIONAL ADYISQRY C0M3TTITEE FOR AERONAUTICS. Vapor pressure, mb. … Fig. 1. Mean free-air temperatures at about latitude Fig. 2. Mean free-air vapor pressures at aboU lailtudc 40* N. 40° N. in the United States, in the United Etatcs. Pressure, mb. Fiq.3. Mean tree-air barometrio pressures at about latitude Fia.4. Mean free-air densities at about latitude 40* N. in…
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