thumb|right|250px|Aeroscope (1910) thumb|250px|Geoffrey Malins with aeroscope camera during [[World War I]] Aeroscope, from Ancient Greek ἀήρ (aḗr), meaning "air", and σκοπέω (skopéō), meaning "to look", was a type of compressed air camera for making films, constructed by Polish inventor Kazimierz Prószyński in 1909 (French patent from 10 April 1909) and built in England since 1911, at first by Newman & Sinclair, and from 1912 by Cherry Kearton Limited.
thumb|right|250px|Aeroscope (1910) thumb|250px|Geoffrey Malins with aeroscope camera during [[World War I]] Aeroscope, from Ancient Greek ἀήρ (aḗr), meaning "air", and σκοπέω (skopéō), meaning "to look", was a type of compressed air camera for making films, constructed by Polish inventor Kazimierz Prószyński in 1909 (French patent from 10 April 1909) and built in England since 1911, at first by Newman & Sinclair, and from 1912 by Cherry Kearton Limited.
==Background== Patented in England in 1910 by the Polish inventor Kazimierz Prószyński, Aeroscope was the first successful hand-held operated film camera. It was powered by compressed air pumped before filming into the camera with a hand pump similar to a bicycle pump. A crank was not needed to advance the loaded film unlike other cameras of the time. The camera could then be operated with both hands: holding the camera and controlling the focus. This made it possible to film with the Aeroscope hand-held in difficult field circumstances, from airplanes, and for military purposes. The Aeroscope carried of 35mm film and, once pressurised, could work with no further pumping for up to 10 minutes. The Aeroscope was known for its simplicity and reliability.
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