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The legs of a table are crossed and hinged together. You can vary the height by rotating the legs around the hinges. The barrel of a hydraulic jack is fixed to one pair of legs and its piston is fixed to the other pair of legs.
Contributed by: Sándor Kabai (October 2007)
Open content licensed under CC BY-NC-SA
Wolfram Demonstrations Project
Published: October 3 2007