Trammel of Archimedes

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This clever contraption consists of a sturdy base with two intersecting slots, perfectly aligned at right angles. Two smooth sliders are neatly confined within the slots and connected to a handy handle via pivots (screws) securely fastened along its length. By employing this mechanism, users can effortlessly draw precise ellipses. To do so, simply position a writing instrument at the end of the handle while making a full rotation. Many people purchase these devices in novelty stores with intriguing names like Bullsht Grinder, Bullsht Masher or Do-Nothing Machine. Interestingly, most of these titles are preceded by state names such as Arkansas, Kentucky, and so on. It appears that locals often mock their neighbors through this humorous naming convention. For additional information and step-by-step instructions, please visit https://www.instructables.com/id/Trammel-of-Archimedes/. To see the mechanism in action, watch the animation at https://youtu.be/NiEOJxK4AYA.