https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/14006731Edit ImageSaveSaveEditCropCustom TextBuilding: floor joists, simple and composite wooden beams. 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 968 x 1200 px | 300 dpiLarge JPEG 2480 x 3073 px | 300 dpiFree DownloadBuilding: floor joists, simple and composite wooden beams. Engraving by J. Davis after R. Tredgold, 1820.More