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Gyroscopic Instruments for Instrument Flying (1938)
NASA Technical Reports Server (NTRS) · leaf 47
I - Fnotograpn of double toxoat venturi tube o: tne type used Figure 19 to operate the directional gyro or tne gyroscopic :.orizon.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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