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arch head

noun, Machinery.
a vertical, arc-shaped member fixed to the end of a walking beam, for supporting a chain from which a pump rod or the like is suspended in such a way as to let it rise and fall vertically. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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  • It is divided into four lights, and the arch-head is filled with good simple tracery.

    Scottish Cathedrals and Abbeys Dugald Butler and Herbert Story

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