https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13989678Edit ImageSaveSaveEditCropCustom TextRoyal Institution, Manchester, England. Line engraving by R. Winkles after Harwood.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 1200 x 839 px | 300 dpiLarge JPEG 3268 x 2284 px | 300 dpiFree DownloadRoyal Institution, Manchester, England. Line engraving by R. Winkles after Harwood.More