Clocks: two composite pendulums, and diagrams of their motions. Coloured engraving by J. Pass, 1809. https://www.rawpixel.com/image/13960478/image-paper-art-musicFree Image from public domain licenseClocks: composite pendulum, side and front view with details. Engraving by Mutlow. https://www.rawpixel.com/image/13971141/image-paper-pattern-public-domainFree Image from public domain licenseClocks: composite pendulum, side and front view with details. Engraving by Mutlow. https://www.rawpixel.com/image/13970980/image-public-domain-drawing-clocksFree Image from public domain license