PATENT DIAGRAM, FIG 2
Figure 1 and figure 2 were the diagrams submitted along with Muybridge’s patent application. Here is an excerpt from Muybridge’s patent application filed June 27, 1878:
Figure 2 shows a side view of the camera slides, track, and background and the position of the camera (B).
“My invention has reference to that branch of photography which is known as ‘instantaneous photography,’ and it applies more particularly where the object to be photographed is in rapid motion.
The principal object which I have in view is to take photographic views of horses that are moving rapidly under speed, in order to determine the posture, position, and relation of their limbs in different portions of their step or stride.
My invention relates to a double-acting slide, with the means of operating the same, and to a novel background, which is graduated or marked so as to gage [sic] the position of the horse and the posture of his limbs…”