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\begin{figure}\begin{center}\BoxedEPSF{Pantograph.epsf scaled 1200}\end{center}\end{figure}

A Linkage invented in 1630 by Christoph Scheiner for making a scaled copy of a given figure. The linkage is pivoted at $O$; hinges are denoted $\odot$. By placing a Pencil at $P$ (or $P'$), a Dilated image is obtained at $P'$ (or $P$).

See also Linkage

© 1996-9 Eric W. Weisstein