stathmograph

from The Collaborative International Dictionary of English v.0.48

Stathmograph \Stath"mo*graph\ (st[a^]th"m[-o]*gr[.a]f), n. [Gr.
   sta`qmh a measuring line + -graph.]
   A contrivance for recording the speed of a railway train.
   --Knight.
   [1913 Webster] Static