https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/14010392Edit ImageSaveSaveEditCropCustom TextPneumatics: two men extracting [] air from an iron sphere. Engraving, 16--.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 1200 x 966 px | 300 dpiLarge JPEG 3112 x 2504 px | 300 dpiFree DownloadPneumatics: two men extracting [] air from an iron sphere. Engraving, 16--.More