https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13974962Edit ImageSaveSaveEditCropCustom TextOptics: lens grinders at work (top) and stages in grinding a lens with the tools used (below). Engraving by Benard after Lucotte.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 777 x 1200 px | 300 dpiLarge JPEG 2126 x 3284 px | 300 dpiFree DownloadOptics: lens grinders at work (top) and stages in grinding a lens with the tools used (below). Engraving by Benard after Lucotte.More