https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13963207Edit ImageSaveSaveEditCropCustom TextCross-section of the common sewers and Gregson's pneumatic apparatus. Coloured engraving, 1813.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 1200 x 768 px | 300 dpiLarge JPEG 3256 x 2084 px | 300 dpiFree DownloadCross-section of the common sewers and Gregson's pneumatic apparatus. Coloured engraving, 1813.More