way shaft
Webster's Dictionary (GCIDE)
Rock shaft \Rock" shaft`\ [Cf. Rock, v. i.] (Mach.) 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. [1913 Webster]
Way shaft \Way" shaft`\
1.(Mach.) A rock shaft. [1913 Webster]
2.(Mining) An interior shaft, usually one connecting two levels. --Raymond. [1913 Webster]