Bars of a Hyperboloid
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Two parallel rings are interconnected with two sets of parallel bars. You can move the ends of the bars of the two sets around the blue ring in opposite directions using the "twist" slider. The envelope of the bars is a hyperboloid.
Contributed by: Sándor Kabai (March 2011)
Open content licensed under CC BY-NC-SA
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"Bars of a Hyperboloid"
http://demonstrations.wolfram.com/BarsOfAHyperboloid/
Wolfram Demonstrations Project
Published: March 7 2011