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