chronophotograph

from The Century Dictionary.

• noun In photography, a single photograph of a series taken at equal intervals, usually on a moving film.
• noun A series of photographs representing phases of a cycle. (See cuts at rack, run, trot, and walk.)
• noun An apparatus for obtaining a succession of photographs at regular intervals of time.

from the GNU version of the Collaborative International Dictionary of English.

• noun One of a set of photographs of a moving object, taken for the purpose of recording and exhibiting successive phases of the motion.