millstone draft

The degree of deflection of the furrows of a millstone from a radial direction. Thus in a 7-inch draft the track-edges are tangent ial to a 7-inch circle. millstone-dre , s. Grinding; 1. The arrangement and disposition of the furrows in the face of a millstone. The furrows lead from the bosom, around the eye, to the skirt of the millstone-that is to say, to its periphery. 2. The draft given to the furrows on a millstone. millstone-dre er, s. A machine for cutting grooves in the grinding-face of a millstone. millstone-grit, s . Geol.: A coarse quartzose sandstone used for millstones. It underlies the coal measures, and overlies the Carboniferous Limestone, constituting the second of the three divisions of the Carboniferous formations. A bed of shale 400 feet thick, ranked with the Millstone-grit, is called by miners Farewell rock.