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A wheel having a groove in the rim for a rope to work in, and set in a block, mast, or similar; the wheel of a pulley.
1942 September and October, Charles E. Lee, “The Stanhope & Tyne Railway: II–Self-Acting Inclines”, in Railway Magazine, page 263:
To an exceptional degree the duties on these inclines have been passed on from father to son; many a boy has begun his working life in oiling the sheaves and, after passing through every grade, has reached the age of retirement in the responsible position of brakesman.