Jean Sylvain Bailly, Mayor of Paris, with his mistress, both represented as chickens. Etching, 1791. https://www.rawpixel.com/image/13984686/image-paper-cartoon-faceFree Image from public domain licenseSignal Tower on Elk Mountain, Maryland, overlooking battlefield of Antietam by Timothy H O Sullivan and Alexander Gardner https://www.rawpixel.com/image/14326186/image-plant-person-woodFree Image from public domain licenseLondon, seen from beside Flamsteed House in Greenwich park. Lithograph by T. S. Boys after himself, 1842. https://www.rawpixel.com/image/14003538/image-frame-plant-personFree Image from public domain licenseKing George I representing royalty, a bishop representing episcopacy; and a judge representing law, all as seen through a… https://www.rawpixel.com/image/13985904/image-cartoon-person-moonFree Image from public domain license"Lalande", Statue by Jean-Joseph Perraud, Decoration of the Louvre, Paris by Édouard Baldus https://www.rawpixel.com/image/14324322/image-face-person-artFree Image from public domain licenseSecond mate of yacht observing radiation thermometers on Mount Guajara by Charles Piazzi Smyth https://www.rawpixel.com/image/14319762/image-face-hand-personFree Image from public domain licenseEpidaure, restauration & description des principaux monuments du sanctuaire d'Asclépios / relevés et restaurations par… https://www.rawpixel.com/image/14010677/image-pattern-circle-public-domainFree Image from public domain licenseOptics: a telescopic microscope, and hand-lenses. Aquatint, 1787 [by R. Laurie after Milne ]. https://www.rawpixel.com/image/14019709/image-paper-hand-public-domainFree Image from public domain licenseA Day's Deerstalking: Now for it. Here Goes. Slap, Bang by Ronald Ruthven Leslie Melville https://www.rawpixel.com/image/14321897/image-face-people-grassFree Image from public domain licenseAstronomy: a large refracting telescope, and projection of the transit of Venus. Wood engraving. https://www.rawpixel.com/image/14021664/image-cartoon-person-artFree Image from public domain licenseThe workshop of the spectacle maker and examples of his craft. Line engraving by ÆB. https://www.rawpixel.com/image/14002223/image-cartoon-person-airplaneFree Image from public domain licenseThree men looking through telescopes at young women bathing in the sea. Wood engraving. https://www.rawpixel.com/image/14003617/image-dog-horse-cartoonFree Image from public domain licenseSecond mate of yacht observing radiation thermometers on Mount Guajara by Charles Piazzi Smyth https://www.rawpixel.com/image/14315249/image-hand-person-artFree Image from public domain licenseGreenwich, with people in the foreground, London in the distance. Photo-lithograph by Dawsons after H. Dawson. https://www.rawpixel.com/image/14013738/image-dog-cloud-horseFree Image from public domain licenseSpotprent op de Hollanders (nr. 2), 1795 / 1814 (1814) by anonymous, Vallardi and anonymous https://www.rawpixel.com/image/13783417/image-paper-cartoon-faceFree Image from public domain licenseA barber's shop in which men demonstrate the sense of sight. Etching by W. Peeters after C. de Wael. https://www.rawpixel.com/image/13993290/image-dog-cartoon-personFree Image from public domain licenseAn optical experiment using a giant lens to reflect sun-rays to create fire, with optical instruments scattered and… https://www.rawpixel.com/image/13998202/image-cartoon-person-artFree Image from public domain licenseAstronomy: an observatory telescope, with an astronomer recording the transit of Venus. Engraving by James Basire. https://www.rawpixel.com/image/13991658/image-cartoon-people-artFree Image from public domain licenseA man is looking out of the window through a telescope as young children play on a rocking horse. Etching. https://www.rawpixel.com/image/13986765/image-dog-angel-horseFree Image from public domain licenseGalileo Galilei. Line engraving by P. Bettelini after T. Minardi after D. Cresti, il Passignano, 1624. https://www.rawpixel.com/image/14015516/image-face-person-artFree Image from public domain licenseGalileo Galilei (1564-1642) holding a telescope. Oil painting after Justus Sustermans. https://www.rawpixel.com/image/14000887/image-face-hand-personFree Image from public domain licenseSheepshanks telescope first erected on Mount Guajara, the Peak of Teneriffe in the distance by Charles Piazzi Smyth https://www.rawpixel.com/image/14314313/image-person-art-clothingFree Image from public domain licenseAstronomy: telescopic and photographic equipment, with a device for projecting the shadow of the moon. Wood engraving, 1875. https://www.rawpixel.com/image/13983076/image-cartoon-shadow-personFree Image from public domain licenseThose Beastly Hinds Again! by Ronald Ruthven Leslie Melville https://www.rawpixel.com/image/14323485/those-beastly-hinds-again-ronald-ruthven-leslie-melvilleFree Image from public domain license