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PHHyperbolic Holes: this awesome kit is again available- fun with conic sections- a straight rod, in this case a pencil, glides through a symmetrical pair of curved holes. The design is based on the hyperboloid, the 3D ruled surface traced by an offset rotating diagonal line. This device is sold as an inexpensive kit to assemble yourself, and includes a motor with geared drive and pre-cut pieces. The pencil is my addition- sharpened to just the right size to clear the curved openings. ➡️ Follow the link in my profile for info on where to buy this and other amazing items featured here on @physicsfun #math #mathtoy #mathstoy #geometry #physics #physicstoy #hyperbola #hyperboloid #physicsfun #ruledsurface #conicsection #science
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