Johann Joachim Winckelmann (1717–1768) by Anton Raphael Mengs https://www.rawpixel.com/image/9613346/johann-joachim-winckelmann-1717andndash1768-anton-raphael-mengsFree Image from public domain licenseCalipers for artillery measurement, with many formulae engraved on them. Engraving by A. Bell. https://www.rawpixel.com/image/14020114/image-paper-art-patternFree Image from public domain license