A small periodical change of position in the stars and other heavenly bodies, due to the combined effect of the motion of light and th…
Its definition shares important concepts with this word: shaft, oscillates, journals, instead, revolving.
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Rock shaft
A shaft that oscillates on its journals, instead of revolving, -- usually carrying levers by means of which it receives and communicates reciprocating motion, as in the valve gear of some steam engines; -- called also rocker, rocking shaft, and way shaft.
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