https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/14016169Edit ImageSaveSaveEditCropCustom TextOne 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 CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 834 x 1200 px | 300 dpiLarge JPEG 2318 x 3336 px | 300 dpiFree DownloadOne 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