Adams, Douglas P. Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts.
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A four-bar parallel linkage, with no links fixed, used as a copying device for generating geometrically similar figures, larger or smaller in size, within the limits of the mechanism. In the illustration the curve traced by point T will be similar to that generated by point S. This similarity results because points T and S will always lie on the straight line ; triangles OBS and TCS are always similar because lengths , , , and are constant and is always parallel to . Distance always maintains a constant proportion to distance because of the similarity of the above triangles. Numerous modifications of the pantograph as a copying device have been made. See also: Four-bar linkage
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