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Rock-shaft.


Steam-engine.) a. A shaft with tappets which raise the levers of the puppet-valves in a certain class of steam-engines.

b. The shaft, with levers, used for working the slide-valves, the notch of the eccentric rod dropping into a stud fixed in one of the levers; the links of the slide-valve spindle being attached to the opposite lever on the same shaft. [1961]

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