1) A gear wheel with cogs or teeth on the periphery which could be attached to the axle of the water wheel (OED).

The term is on record from 1731 and it was used in an estimate for Sandbed Wheel on the river Don in 1863. In c.1760, a Wakefield clothier wrote: How to make wheels in the spur way best and cheapest. Bye a strong bar of iron of 4 or 5 inches brood so piece both ends together and cut pieces out in the edge has thus for iron cogs and those sorts of wheels will work easey and keep them oyld with cow foot oyll.

places Wakefield
dates 1731 1760

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