Eadweard J. Muybridge, Sequenced image of a rotating sulky wheel and self portrait, ca. 1887, negative, gelatin on glass, George Eastman House. A series of twenty three small glass negative images of a rotating sulky wheel that was used by Muybridge to determine the length of time between exposures; the last image in the grid is a small glass positive image of Muybridge himself.

Eadweard J. Muybridge, Sequenced image of a rotating sulky wheel and self portrait, ca. 1887, negative, gelatin on glass, George Eastman House.
A series of twenty three small glass negative images of a rotating sulky wheel that was used by Muybridge to determine the length of time between exposures; the last image in the grid is a small glass positive image of Muybridge himself.