Eadweard Muybridge (1830-1904) [yes! same dates !!] An analysis of the movement on successive plates (close to the principle of the cinema)
How the legs of the galloping horse were perceived by painters before photography (here George Stubbs, William Anderson with Two Saddled Horses, 1793, The Royal Collection, London)
and how they actually move (Eadweard Muybridge)