Question

eadweard muybridges horse experiments were originally designed to: test celluloids durability prove a theory about a horses gallop entertain audiences create the first film camera

Explanation:

Eadweard Muybridge's horse experiments were part of a bet to prove whether a horse had all four feet off the ground simultaneously while galloping. His sequential photography was used to analyze the horse's motion and settle this question.

Answer:

Prove a theory about a horse's gallop