A pantograph is a mechanical linkage connected in a manner based on parallelograms so that the movement of one pen, in tracing an image, produces identical movements in a second pen. If a line drawing is traced by the first point (or pen), a geometrically identically shaped, enlarged, or miniaturised copy will be drawn by a pen (point) fixed to the other.
Different kinds of pantographs are used for other forms of duplication in areas such as sculpting, minting, engraving, and milling.
Perspective Research Centre 
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