https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13951440Edit 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 936 x 1200 px | 300 dpiLarge JPEG 2511 x 3219 px | 300 dpiFree DownloadAdam Walker, a natural philosopher, performing scientific experiments. Coloured etching after J. Gillray, 1796.More