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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.

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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!

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