The Collaborative International Dictionary of English v.0.48:

Chronograph \Chron"o*graph\, n. [Gr. ? time + -graph: cf. F.
   chronographe.]
   1. An instrument for measuring or recording intervals of
      time, upon a revolving drum or strip of paper moved by
      clockwork. The action of the stylus or pen is controlled
      by electricity.
      [1913 Webster]

   2. Same as Chronogram, 1. [R.]
      [1913 Webster]

   3. A chronoscope.
      [1913 Webster]

WordNet (r) 3.0 (2006):

chronograph
    n 1: an accurate timer for recording time