https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13951530Edit ImageSaveSaveEditCropCustom TextElectric discharges in vacuum tube, belonging to J.P. Gassiot. Coloured lithograph etching, ca. 1860.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 732 x 1200 px | 300 dpiLarge JPEG 2038 x 3342 px | 300 dpiFree DownloadElectric discharges in vacuum tube, belonging to J.P. Gassiot. Coloured lithograph etching, ca. 1860.More