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By George Hart for the Museum of Mathematics

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A string hyperboloid can be made by running strings between two circles and rotating one relative to the other. Here’s one large enough to stand inside of—it is fourteen feet high—between four-foot diameter circles.

hyperboloid mockup Math Monday: String Hyperboloid
It is easy to make your own. Just cut out two circles from a sheet of plywood, drill a series of equally spaced holes, and be prepared to tie lots of knots.

hyperboloid knots Math Monday: String Hyperboloid

More:
See all of George Hart’s Math Monday columns

Gareth Branwyn

Gareth Branwyn is a freelancer writer and the former Editorial Director of Maker Media. He is the author or editor of a dozen books on technology, DIY, and geek culture, including the first book about the web (Mosaic Quick Tour) and the Absolute Beginner’s Guide to Building Robots. He is currently working on a best-of collection of his writing, called Borg Like Me.


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