Abstract
To see if Prof. H. Hartridge's explanation1 of the effect discovered by Dr. A. Loewenstein2 was justified, the experiment described by them was repeated on a comprehensive scale. Four nickel threepenny bits coined in 1942 were selected and two of them had their edges and heads filed off* so that a flat surface was obtained on both. One coin of each pair was polished to a high degree: special attention was paid to the regions near the edges being as bright as those near the centre. The other filed coin was brought into contact with 'Plasticene, which tarnished its surface immediately. This was more satisfactory than oxidation by heating, since the risk of deforming the coin was eliminated. The remaining coin was dull and needed no attention.
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References
Nature, 156, 118 (1945).
Nature, 155, 672 (1945).
Nature, 156, 269 (1945).
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WEIL, R. [Letters to Editor]. Nature 156, 636–637 (1945). https://doi.org/10.1038/156636c0
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DOI: https://doi.org/10.1038/156636c0
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