Trammel of Archimedes
grabcad
The device features a base with two intersecting slots at right angles, housing sliders linked to a handle via fixed pivots. This mechanism can accurately draw ellipses by positioning a writing tool on the end of the handle while it revolves fully. Often found in novelty shops and given amusing names such as Bullsh*t Grinder or Do-Nothing Machine, with state-based prefixes adding local humor. Learn more or build at: https://www.instructables.com/id/Trammel-of-Archimedes/; watch it in action here: https://youtu.be/NiEOJxK4AYA
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