Optigraph

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Optigraph \Op"ti*graph\, n. [Optic + -graph: cf. F.
     opticographe. See {Optic}, a. ]
     A telescope with a diagonal eyepiece, suspended vertically in
     gimbals by the object end beneath a fixed diagonal plane
     mirror. It is used for delineating landscapes, by means of a
     pencil at the eye end which leaves the delineation on paper.


     [1913 Webster]