Eadweard Muybridge created the first moving pictures in 1877 and 1878. His work grew from Leland Stanford's commission to determine whether there was a point in a horse's gallop where all four feet were airborn at the same time.
This series was originally 16 images; here the third frame is missing.
It was originally displayed on a 'Zoopraxiscope,' created by painting the images on a glass disc.
The images were projected by spinning the disc while shining a light through the glass.
Muybridge's work was the primary inspiration for Thomas Edison's 'Kinetoscope,' which created the basis for motion pictures.
You can learn more by searching online for 'Sallie Gardner at a Gallop.'