Abstract
RECENTLY E. Brüche and W. Knecht1 described the electronoptical observation of the transition of into iron. In their beautiful experiments, however, the emission of the test-piece (after activation by means of an evaporated barium layer) at the transition temperature of about 900° C. was so small that the actual occurrence of the process could not be observed on the fluorescent screen without sufficient adaptation of the eye. In order to obtain a fluorescent image clear enough to be photographed, the temperature of the test-piece had to be raised to about 1000° C. A photographic record of the transition could therefore only be obtained by observing whether, after lowering the temperature to the neighbourhood of the transition point and raising it again at 1000°, the texture of the test-piece had changed or not.
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References
E. Brüche und W. Knecht, Z. tech. Phys., 16, 95; 1935. 15, 461; 1934.
M. Knoll, F. G. Houtermans und W. Schulze, Z. Phys., 78, 340; 1932. J. Pohl, Z. tech. Phys., 15, 579; 1934. See also E. Brüche, Kolloidzeitschrift, 69, 389; 1934.
H. J. Wiester, Z. Metallk., 24 276; 1932. A similar cinematographic record of the --transition in iron and steel has also been obtained by H. Esser and H. Cornelius (Stahl und Eisen, 53, 532; 1933).
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BURGERS, W., VAN AMSTEL, J. Cinematographic Record of the Iron Transition, as seen by the Electron-Microscope. Nature 136, 721 (1935). https://doi.org/10.1038/136721a0
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DOI: https://doi.org/10.1038/136721a0
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