Image: Photomicrograph of annealed and quenched steel, from 1911 Britannica plates 11 and 14
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Description: Photomicrographs of steel. The top photo shows annealed steel, while the bottom shows quenched steel.
Title: Photomicrograph of annealed and quenched steel, from 1911 Britannica plates 11 and 14
Credit: = Encyclopædia Britannica Eleventh Edition Vol. 1, Plate between pp. 704 and 705, Fig. 14. Files retrieved from Wikipedia, here and here then combined into a split-picture. Photos are pre-1911
Author: Osmond and Cartaud.
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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