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Wooden ellipsograph (ca. 1900) now at Smithsonian Ellipsograph on display at Musée d'histoire des sciences de la Ville de Genève. An ellipsograph is a trammel of Archimedes intended to draw, cut, or machine ellipses, e.g. in wood or other sheet materials. An ellipsograph has the appropriate instrument (pencil, knife, router, etc.) attached to ...
If the center and the semi axis of an ellipse are determined the ellipse can be drawn using an ellipsograph or by hand (see ellipse). Rytz’s construction is a classical construction of Euclidean geometry, in which only compass and ruler are allowed as aids. The design is named after its inventor David Rytz of Brugg (1801–1868).
English: Animation of an ellipsograph, or trammel of Archimedes, drawing an ellipse. Done in Blender by Hugo Spinelli. File for the 3D model can be found here: ...
The more generic term "ellipsograph" currently redirects to this article, and ellipsographs in general are described in a section near the end. In my opinion this article would be improved by re-organizing it to make the general topic of drawing ellipses be its root scope, with the elliptic trammel as a top-level section, as a sibling to other ...
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If there is no ellipsograph available, one can draw an ellipse using an approximation by the four osculating circles at the vertices. For any method described below, knowledge of the axes and the semi-axes is necessary (or equivalently: the foci and the semi-major axis).
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In 1813 Farey also constructed a machine for drawing ellipses, the so-called ellipsograph. The device became so popular, that the 6th edition of the Encyclopædia Britannica (1824) included an article about it, which started with: Elliptograph in Encyclopædia Britannica, 1824. ELLIPTOGRAPH, an instrument for drawing ellipses.
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