https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13991868Edit ImageSaveSaveEditCropCustom TextJohn Armstrong. Stipple engraving by W. Ridley after W. H. Brown.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 775 x 1200 px | 300 dpiLarge JPEG 1290 x 1998 px | 300 dpiFree DownloadJohn Armstrong. Stipple engraving by W. Ridley after W. H. Brown.More