| 释义 |
optigraph|ˈɒptɪgrɑːf, -æ-|
[irreg. f. Gr. ὀπτ-ός seen + -graph.]
A contrivance for copying landscapes, consisting of a telescope placed in a vertical position so that the rays from the object are reflected from an inclined mirror through the object-glass and then from another through the eye-glass, in the focus of which is placed a movable plane glass having at its centre a small dot, which can be moved over the outline of the image.
1864in Webster. 1875in Knight Dict. Mech. |