https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13971382Edit ImageSaveSaveEditCropCustom TextJedediah Buxton, a mental calculator. Etching after Mary Hartley.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 966 x 1200 px | 300 dpiLarge JPEG 1398 x 1737 px | 300 dpiFree DownloadJedediah Buxton, a mental calculator. Etching after Mary Hartley.More