1870s photos proved a horse does have its four feet off the ground at once, satisfying this railroad magnate's curiosity
... to prove all four 
hooves were off the ground at the same time when a horse runs has been told... [DOC] [TLE] The Birth of Film - The Beginning of Motion Picture Making ... [PAR] Jun 11, 2012 ... Until his experiments in the 1870s, photography was all the rage, but no one ...