51Թ

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rockshaft

[rok-shaft, -shahft]

noun

Machinery.

  1. an oscillating shaft.

rockshaft

/ ˈɒˌʃɑːڳ /

noun

  1. 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” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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51Թ History and Origins

Origin of rockshaft1

First recorded in 1870–75; rock 2 + shaft

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rock saltrock-shelter

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