Cock illustrated by Charles Dessalines D' Orbigny (1806-1876). Digitally enhanced from our own 1892 edition of Dictionnaire… https://www.rawpixel.com/image/323962/beautiful-roosterFree Image from public domain licenseEngineering: large cogs meshing together, and diagrams of epicycloid curves. Colour lithograph by Stanislas Petit, ca. 1905. https://www.rawpixel.com/image/13951560/image-background-paper-cartoonFree Image from public domain licenseEngineering: large cogs meshing together, and diagrams of epicycloid curves. Coloured lithograph, 1905, by Stanislas Petit. https://www.rawpixel.com/image/13968889/image-paper-art-patternFree Image from public domain licenseSettings icon png sticker illustration, transparent background. Free public domain CC0 image https://www.rawpixel.com/image/6664476/png-sticker-public-domainFree PNG from public domain licenseSettings icon png sticker illustration, transparent background. Free public domain CC0 image https://www.rawpixel.com/image/6664576/png-sticker-public-domainFree PNG from public domain licensePng cog gear clipart, transparent background. Free public domain CC0 image. https://www.rawpixel.com/image/10097268/png-illustrations-public-domainFree PNG from public domain licenseCogwheel png sticker illustration, transparent background. Free public domain CC0 image. https://www.rawpixel.com/image/6743790/png-sticker-public-domainFree PNG from public domain licenseCog gear clipart, illustration vector. Free public domain CC0 image. https://www.rawpixel.com/image/10097293/vector-illustrations-public-domain-technologyFree Vector from public domain licenseA large cylindrical machine with cogs and keys for making music. Engraving. https://www.rawpixel.com/image/13957589/large-cylindrical-machine-with-cogs-and-keys-for-making-music-engravingFree Image from public domain licenseVintage gear from The Cycle Directory published by Cassell & Co. (1884). Original from the British Library. Digitally… https://www.rawpixel.com/image/561161/gear-cog-vintage-styleFree Image from public domain licenseRack railway from A Wheel to Moscow and Back. The Record of a Record Cycle Ride... With a Preface by A.R Saville published… https://www.rawpixel.com/image/561142/metal-bicycle-chainFree Image from public domain licenseClocks: jigs for spring-coiling (top), and cog-placing (below). Engraving by Lachaussé after L.J. Goussier. https://www.rawpixel.com/image/13974389/image-cartoon-technology-public-domainFree Image from public domain licenseA large cylindrical machine with cogs and keys for making music. Engraving. https://www.rawpixel.com/image/13980127/large-cylindrical-machine-with-cogs-and-keys-for-making-music-engravingFree Image from public domain license