Rock shaft


[rok-shaft, -shahft]
noun Machinery.
an oscillating shaft.

1870–75; rock2 + shaft Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
rockshaft (ˈrɒkˌʃɑːft)
a shaft that rotates backwards and forwards rather than continuously, esp one used in the valve gear of a steam engine

Collins English Dictionary - Complete & Unabridged 10th Edition
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