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The installation and correction of compasses in airplanes (1927)
NASA Technical Reports Server (NTRS) · leaf 21
N.A.C.A. Technical Note No.263 Fig.4 < Bell Pivot \ J / Cage … Parts Pivot touching has vibrated to one side of jewel Fig. 4NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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