Camera lucida n. (Opt.) An instrument which by means of a prism of a peculiar form, or an arrangement of mirrors, causes an apparent image of an external object or objects to appear as if projected upon a plane surface, as of paper or canvas, so that the outlines may conveniently traced. It is generally used with the microscope.
... A sketch of this view from Parks Hill is annexed to the report, and lest any doubt be entertained of its accuracy it is proper to state that the unassisted vision was not relied upon, but that the outlines were carefully delineated by means of the camera lucida. ... — A Compilation of the Messages and Papers of the Presidents: Tyler - Section 2 (of 3) of Volume 4: John Tyler • Compiled by James D. Richardson
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