Pump Jack
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One of the bars of a four-bar linkage is extended beyond its hinge to model the operation of a pump jack. Pump jacks are used to pump oil out of the ground.
Contributed by: Sándor Kabai (January 2008)
Open content licensed under CC BY-NC-SA
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"Pump Jack"
http://demonstrations.wolfram.com/PumpJack/
Wolfram Demonstrations Project
Published: January 24 2008