Ŏp'ti-grāph, n.

n. [For opticograph, Fr. opticographe, from Gr. ὀπτικός, belonging to seeing or sight, and γράφειν, to write. See OPTIC.] A telescope with a diagonal eye-piece, suspended vertically in gimbals by the object-end beneath a fixed diagonal plane mirror, for delineating landscapes, &c., by so moving it that a dot in the center of the field is made to pass over the outlines of an object, while a pencil at the eye-end leaves the delineation on paper.