https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/14015750Edit ImageSaveSaveEditCropCustom TextAn industrial lathe for cutting screw threads: from the side (upper figure) and from above (lower figure). Lithograph by Mackay & Kirkwood, 1860.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 1200 x 781 px | 300 dpiLarge JPEG 3307 x 2153 px | 300 dpiFree DownloadAn industrial lathe for cutting screw threads: from the side (upper figure) and from above (lower figure). Lithograph by Mackay & Kirkwood, 1860.More