01 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…
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1.
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.(Opt.)