The Altitude Effect on Air Speed Indicators (1921)
NASA Technical Reports Server (NTRS) · leaf 14
irectly through the outer wall of the iron container to one side of a water manometer. The impact pressure grid is similarly connected to the other side of the same manometer. A mercurial barometer for determining the absolute pressure in the wind stream is connected to the static side of that… … Fig. 3.—Vacuum wind tunnel. In taking observations the usual procedure was to hold the internal pressure approximately constant by means of the vacuum pump while varying the speed of the blower step by step. This process would then be repeated at a different pressure. Artificial changes of…
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