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Device for measuring sound in airplane engines (1924)

NASA Technical Reports Server (NTRS) · leaf 5

An illustration from Device for measuring sound in airplane engines, 1924, leaf 5
N.A.C-A. Technical memorandum No.266 Figal,2 & 3. … Fig. 3

NASA Technical Reports Server (NTRS)

Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.

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