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An electric monowheel called Dynasphere was tested in 1932 in the United Kingdom. [11] [12] In 1971, an American inventor named Kerry McLean built his first monocycle (aka monowheel). In 2000, he built a larger version, the McLean Rocket Roadster powered by a Buick V-8 engine, which subsequently crashed in 2001 during the initial test run.
Purves was optimistic about his invention's prospects. As reported in a 1932 Popular Science magazine article, after a filmed test drive in 1932 on a beach in Weston-super-Mare, Somerset, he stated that the Dynasphere "reduced locomotion to the simplest possible form, with consequent economy of power", [1] and that it was "the high-speed vehicle of the future". [1]
Contax S of 1949 – , the second pentaprism SLR The first SLR with a fixed pentaprism was the Rectaflex Asahiflex IIb, 1954 Nikon F of 1959 – the first Japanese system camera. The first practical reflex camera was the Franke & Heidecke Rolleiflex medium format TLR of 1928. Though both single- and twin-lens reflex cameras had been available ...
Edwin H. Land introduces the first Polaroid instant camera. 1949 – The Contax S camera is introduced, the first 35 mm SLR camera with a pentaprism eye-level viewfinder. 1952 – Bwana Devil, a low-budget polarized 3-D film, premieres in late November and starts a brief 3-D craze that begins in earnest in 1953 and fades away during 1954.
Aerial Age Nov. 7 1921, magazine cover with aerial photo of Columbia University shot by W. L. Hamilton for Fairchild Aerial Camera Corp. Fairchild F-1 Aerial Camera. In 1917, after being rejected from the military because of his poor health, Fairchild was determined to find another way to support the World War I effort. [4]
A monowheel tractor or monowheel-drive tractor is a light transport and agricultural vehicle that is driven and controlled by an engine and steering mechanism mounted on a single large wheel, with the load-carrying body trailing behind.
The Eyemo is a non-reflex camera: viewing while filming is through an optical viewfinder incorporated into the camera lid. Some models take one lens only. In 1929 there was the first three-port Eyemo, while the "spider model" features a rotating three-lens turret and a "focusing viewfinder" on the side opposite the optical viewfinder.
His first machine was built in April 1845 to continuously trace the varying indications of meteorological equipment on photographic paper. [4] The cameras were supplied to numerous observatories around the world and some remained in use until well into the 20th century.