99 REGULATION OF STEAM . the engine - shaft , it becomes imperative to use an eccentric sheave , over which is placed a loose strap , to which is attached the eccentric rod ; thus the eccentric sheave revolves inside of the strap , and the … Fig . 49 . — Eccentric Sheave . delineating the engine - shaft , and a , Centre of engine - shaft . b , Centre of eccentric , on this line set off ab ; this we will e f , Thickness of metal round shaft . c d equals a b , multiplied by 2 . name the crank of the eccentric , the point B denoting the…
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