https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/14017052Edit ImageSaveSaveEditCropCustom TextEngineering: a wide-span wooden truss-beam roof. Engraving by J. Davis after R. Tredgold, 1820.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 1200 x 657 px | 300 dpiLarge JPEG 3500 x 1916 px | 300 dpiBest Quality JPEG 3625 x 1984 px | 300 dpiFree DownloadEngineering: a wide-span wooden truss-beam roof. Engraving by J. Davis after R. Tredgold, 1820.More