https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13986276Edit ImageSaveSaveEditCropCustom TextChemistry: two types of burning-glass, and a glass-polishing machine. Engraving by A. Bell.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 945 x 1200 px | 300 dpiLarge JPEG 2300 x 2922 px | 300 dpiFree DownloadChemistry: two types of burning-glass, and a glass-polishing machine. Engraving by A. Bell.More