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One block of glass, one of aluminium, two of calcite and two of quartz, viewed under x-ray. Photoprint from radiograph by W.K. Röntgen, 1895.

Original public domain image from Wellcome Collection

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One block of glass, one of aluminium, two of calcite and two of quartz, viewed under x-ray. Photoprint from radiograph by W.K. Röntgen, 1895.

More