An early form of gear wheel consisting of STAVES mortised between two wooden discs or flanges (TRINLEBOARDS) the STAVES serving as COGS, and engaging a SPUR or FACE GEAR.
The furrow pattern of a pair of MILLSTONES where the RUNNER STONE rotates anticlockwise as seen from above (in a conventional windmill or watermill layout).
With millstones DRESSED with HARP pattern furrows, a MASTER FURROW, when viewed from one edge of the stone, passes from the left-hand side of the EYE (DRAFT CIRCLE) to the edge of the stone towards the viewer. The minor furrows lie parallel to it on its left hand side. With SICKLE DRESS and other variants of curved furrows, the furrows similarly pass generally from the left hand side of the draft circle towards the viewer. Both stones of the pair usually carry an identical DRESS as viewed when DRESSING, i.e. with RUNNER STONE face-up.
A pair of MILLSTONES carrying LEFT-HAND DRESS.