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History
John Farey Jr.
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John Farey Jr. was an English mechanical engineering, consulting engineer and patent agent, known for his pioneering contributions in the field of mechanical engineering.
Daguerreotype by Henry Gengembre, 1840s.
Daguerreotype by Henry Gengembre, 1840s.
Illustration on Mechanics in the British Encyclopedia, 1809
Illustration on Mechanics in the British Encyclopedia, 1809
Grave of John Farey in Highgate Cemetery
Grave of John Farey in Highgate Cemetery
Tree instruments for making perspective drawings, 1814. Farey's invention is pictured in the middle in fig. 4 and 5.
Tree instruments for making perspective drawings, 1814. Farey's invention is pictured in the middle in fig. 4 and 5.
Trammel of Archimedes
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A trammel of Archimedes is a mechanism that generates the shape of an ellipse. It consists of two shuttles which are confined ("trammeled") to perpendicular channels or rails and a rod which is attached to the shuttles by pivots at fixed positions along the rod.
"Bullshit Grinder" toy (ca. 1960)
"Bullshit Grinder" toy (ca. 1960)
Wooden ellipsograph (ca. 1900) now at Smithsonian
Wooden ellipsograph (ca. 1900) now at Smithsonian
Ellipsograph on display at Musée d'histoire des sciences de la Ville de Genève
Ellipsograph on display at Musée d'histoire des sciences de la Ville de Genève