Abstract
A COMMUNICATION by L. L. Van Reijen1 refers to a recovery effect after an interval of some months in filed copper powder. This was shown by X-ray transmission photographs of a thin layer of the powder specimen. He used the same interval of time when verifying his observation, and presumably did not follow the progress of recovery in detail. However, in view of his reference to rotation powder photographs taken by Megaw, Lipson and Stokes2,3, in which recovery was detected some days after the preparation of the powder, it may be of interest to report that we have detected the self-recovery of filings of electrolytic tough pitch copper several days after filing, in both transmission photographs and rotation powder photographs.
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References
Van Reijen, L. L., Nature, 157, 371 (1946).
Megaw, H., Lipson, H., and Stokes, A. R., Nature, 154, 145 (1944).
Megaw, H., and Stokes, A. R., J. Inst. Metals 71 279 (1945).
Eisenhut, O., and Widmann, H., Z. tech. Phys., 11, 70 (1930).
Widmann, H., Z. Phys., 45, 200 (1927).
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MILLER, J., BANNISTER, L. & HINDE, R. X-Ray Examination of Self-Recovery in Copper. Nature 158, 705–706 (1946). https://doi.org/10.1038/158705b0
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DOI: https://doi.org/10.1038/158705b0
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