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The Collaborative International Dictionary
Ellipsograph

Ellipsograph \El*lip"so*graph\, n. [Ellipse + graph: cf. F. ellipsographe.] An instrument for describing ellipses; -- called also trammel.

Wiktionary
ellipsograph

n. A mechanical instrument used to trace out an ellipse. Applied to draw, cut, etc mathematically correct ellipses (rather than general ovals).

Usage examples of "ellipsograph".

Compasses, T-squares, rulers, protractors, and ellipsographs obeyed the touch of his fingers as if inspired with life.