The Collaborative International Dictionary of English v.0.48:

Rotograph \Ro"to*graph\, n. (Photography)
   A photograph printed by a process in which a strip or roll of
   sensitized paper is automatically fed over the negative so
   that a series of prints are made, and are then developed,
   fixed, cut apart, and washed at a very rapid rate.
   [Webster 1913 Suppl.]