walking beam

noun Machinery.
an overhead oscillating lever, pivoted at the middle, for transmitting force from a vertical connecting rod below one end to a vertical connecting rod, pump rod, etc., below the other end.

Origin:
1835–45, Americanism

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
The images clearly show the side-by-side smoke stacks and the metal walking
  beam that provided power to the paddle wheels.
Pitman arm: provides vertical movement from the rotating counter balance to the
  walking beam.
However, the weight of the boilers, and other machinery counter-balanced the
  walking beam.
Normally consists of an electric or gas motor that causes an elevated walking
  beam to reciprocate up and down.
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