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Skewer hyperboloid

By George Hart for the Museum of Mathematics

Thirty two shish kabob skewers and 176 small rubber bands are all it takes to make a beautiful hyperbolid of revolution. This is an example of what is called a “ruled surface,” meaning even though it is curved, it is made of straight lines.

hyperboloid standing Math Monday: Skewer hyperboloid

Below is the same object seen from the top. Make one of your own following the instructions here, but be careful not to skewer yourself!

hyperboloid axial view Math Monday: Skewer hyperboloid

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Gareth Branwyn

Gareth Branwyn is a freelancer writer and the former Editorial Director of Maker Media. He is the author or editor of over a dozen books on technology, DIY, and geek culture. He is currently a contributor for Boing Boing and WINK Books. And he has a new best-of writing collection and “lazy man’s memoir,” called Borg Like Me.


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