Mechanics: various machines. Coloured engraving by J. Emslie, 1850, after himself. https://www.rawpixel.com/image/13961976/image-person-technology-public-domainFree Image from public domain licenseBackgrounds astronomy astrology universe. https://www.rawpixel.com/image/12213133/image-background-aesthetic-spaceView licenseArchitecture technology protection security. https://www.rawpixel.com/image/12107086/image-background-design-cartoonView licenseClocks: various types of clock mechanism. Coloured engraving by J. Pass, 1809. https://www.rawpixel.com/image/13966283/clocks-various-types-clock-mechanism-coloured-engraving-pass-1809Free Image from public domain licenseClocks: various views of a clock mechanism. Coloured engraving by J. Pass, 1810. https://www.rawpixel.com/image/13952461/image-cartoon-circle-technologyFree Image from public domain licenseClocks: diagrams of water-clocks. Coloured engraving by J. 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