Per‐spec″to‐graph (?), n. [L. perspectus (p. p. of perspicere to look through) + -graph.] An instrument for obtaining, and transferring to a picture, the points and outlines of objects, so as to represent them in their proper geometrical relations as viewed from some one point.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.