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Watt's Parallel Straight-line Mechanism

Move the Point A and observe the straight line trajectory for the point P

-L2=L4 -L1>L2=L4>L3 -Move the point A (Blue Point) and check the straight line trajectory of the point P (Red point) -Observe that when bars L_2 and L_4 are in parallel positions, L_3 is perpendicular for both bars