IN an earlier communication in Nature1 we have shown that the Vickers pyramid indentation on steel produces a symmetrical distortion surrounding the indentation, this being revealed by multiple-beam interference fringes.
Nature, [164, 103 (1949)].
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TOLANSKY, S., NICKOLS, D. Interferometric Examination of Hardness Indentations on Tin. Nature 164, 840 (1949). https://doi.org/10.1038/164840a0
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