Second 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 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 licenseMEDITERRANEAN SEA (Oct. 27, 2018) The Arleigh Burke-class guided-missile destroyer USS Carney (DDG 64) transits the… https://www.rawpixel.com/image/3399332/free-photo-image-architecture-banister-battleshipFree 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 licensePhiladelphia, United States. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3289686/free-photo-image-antenna-architecture-buildingFree 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 licenseLifeguard station on the sand beach beneath black clouds at Santa Monica. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3290028/free-photo-image-antenna-building-cc0Free 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 licenseAirplane isolated image https://www.rawpixel.com/image/11409010/airplane-isolated-imageView 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 licenseThe saucer-like facade of a sports arena against blue sky. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3289439/free-photo-image-amphitheater-amphitheatre-antennaFree 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 licenseThe Telescope Gallery. by London Stereoscopic and Photographic Company https://www.rawpixel.com/image/14294422/the-telescope-gallery-london-stereoscopic-and-photographic-companyFree Image from public domain licenseAstronomy: telescopic and photographic equipment, with a device for projecting the shadow of the moon. 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Meacham Field. Students learning operation of parachute]. 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