https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13968159Edit ImageSaveSaveEditCropCustom TextCalculi: 9 figures. Line engraving by Campbell, 1816/1821.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 868 x 1200 px | 300 dpiLarge JPEG 1191 x 1647 px | 300 dpiFree DownloadCalculi: 9 figures. Line engraving by Campbell, 1816/1821.More