Motion-analysis
The motion-analysis is the historical term which indicates a photographic technique which makes it possible to take a succession of sights to time interval fixed in order to study the movement of the object photographed.
The principle is to impress a virgin portion of plate or film to each time interval. Several systems were used as the apparatuses with multiple objectives with successive releases but the solution finally brought was the synchronization of the closing of the obturator and the displacement of impressed significant surface. History: The invention of this technique is allotted to Eadweard Muybridge which, before the use of a single apparatus, photographed in 1878 the gallop of one horse using a succession of apparatuses laid out along the way. Muybridge which following bets with the Stanford billionaire on the veracity of the experiments undertaken by Etienne-Jules Marey (marey had to break up the movement of the horse to the step of race with its pneumatic sensor and which had to cause the skepticism of the specialists) gets busy in the company very expensive of reconstituted the movement of the horse to the step of race. It thus aligns 24 cameras on with dimensions one of a track where must run the horse. The 24 apparatuses are enclanchent when the wire on the track are tightened in the passing of the horse. Once the whole of the images gathered on the same support, Muybridge developped at the point the Zoopraxiscope able to project the reconstitution of the movement. (And gained thus are bets on the veracity of the work of marey.)
In France Etienne-Jules Marey this technique with a “photographic rifle” in 1882 for reconstiuer used the movement of the birds in vol.
Photographic rifle used a circular plate which advanced of a constant angle to each closing of obturator. In 1889, Marey used the flexible film.
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