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Old 06-15-2019, 01:07 AM
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June 15, 1878: Eadweard Muybridge takes a series of photographs to prove that all four feet of a horse, Sallie Gardner, leave the ground when it runs; the study becomes the basis of motion pictures.

Sallie Gardner at a Gallop, also known as The Horse in Motion, is a series of photographs consisting of a galloping horse. The series and later experiments like it are precursors to the development of motion pictures. The series consists of 24 photographs shot in rapid succession. Muybridge had arranged the cameras along a track parallel to the horse's path. He used 24 cameras which were 27 inches apart. The shutters were controlled by trip wires triggered by the horse's legs. The photographs were taken in succession 1/25 of a second apart, with the shutter speeds calculated to be less than 1/2000 second. The jockey set the mare to travel at a speed of 1:40, which meant that she was galloping at a mile per 1 minute and 40 seconds, equivalent to 36 miles per hour.

It was released throughout 1878–1880. Muybridge was commissioned by Leland Stanford, the industrialist and horseman, who was interested in gait analysis. The purpose of the shoot was to determine whether a galloping horse ever lifts all four feet completely off the ground during the gait; at this speed, the human eye cannot break down the action. The photographs showed that all four feet are indeed sometimes simultaneously off the ground, though this occurs only when the feet are "gathered" beneath the body, not when the fore and hindlimbs are "extended" as sometimes depicted in older paintings.