https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13985915Edit ImageSaveSaveEditCropCustom TextCivil engineering: the supporting masonry for the Menai box girder bridge. Lithograph by Day & son, 1849, after E. Clark.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 1200 x 813 px | 300 dpiLarge JPEG 3340 x 2264 px | 300 dpiFree DownloadCivil engineering: the supporting masonry for the Menai box girder bridge. Lithograph by Day & son, 1849, after E. Clark.More