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Peaucellier–Lipkin Straight-Line Linkage
Seven bars turn a to-and-fro swing of the crank into a perfectly straight line at the far corner of the rhombus: its distance from the pivot is inverted, |OP||OQ| = ℓ² − s².
Use in Ordinate 2DOpens as a new scene in Research mode, with its graphs and table. Free, no account needed.