
It is a device used to trace ellipses. Here frame is fixed and the sliders translates inside it making every points on the connecting rod to trace an ellipse.

Oldham Coupling
It is a device used to connect two parallel offset beams. Here sliders are perpendicular to each other connected by a disc. Their translation results in the rotation of frame.
Watch mechanism of Elliptical Trammel
Watch mechanism of Oldham Coupling
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