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The Measurement of Air Speed in Airplanes (1937)
NASA Technical Reports Server (NTRS) · leaf 22
N,A,C.A. Technical Note No. 616 Fig. 6 … Figure 6.- Totsil-heai meter (reference 7, fig. 9).NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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