Farey's ellipsograph, 1817.

Image number: 10314076

Farey's ellipsograph, 1817.

This engraved ellipsograph, kept in a mahogany case, was made by John Farey of London. An ellipsograph is used to draw ellipses, which consist of a combination of two circular motions. The drawing pencil is fixed in position in a central ring, which then revolves. At the same time, the ring is carried round in a circle, and the pencil traces the combination of these two paths.

Image number:
10314076
Credit:
Science Museum/Science & Society Picture Library
Date taken:
20 October 2003 14:34
Image rights:
Science Museum