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Metal Airplane Construction (1926)
NASA Technical Reports Server (NTRS) · leaf 22
N'.A.C.A. Tec^nic-il feaionsnauni No.561 Fig.4 … 100° 300° 200° 400° 500° 600° 700° 800° Q Tempering temperature, C Fig.; Holtzer steel CN 12, hardened in air at 9oO°Ca Variation of mechanical characteristics plotted against the tempering temperatures.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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