Swiss Compass

This sophisticated linkage has, like a Swiss knife, a wide spectrum of uses. It draws not only circles but also ellipses and straight lines. Just turn the crank. By sliding the blue pencil along its rod, you get a circle at one end, a line at the other, and the full range of ellipses in between.


  • [Snapshot]
  • [Snapshot]
  • [Snapshot]


This Demonstration connects two similar isosceles trapezoids and a rhombus. The equation of the curve is not hard to establish.


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