https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13969726Edit ImageSaveSaveEditCropCustom TextAdam Walker, a natural philosopher, performing scientific experiments. Coloured etching after J. Gillray, 1796.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 973 x 1200 px | 300 dpiLarge JPEG 2710 x 3342 px | 300 dpiFree DownloadAdam Walker, a natural philosopher, performing scientific experiments. Coloured etching after J. Gillray, 1796.More