Flint
Flint is a compact homogeneous substance of a steel-gray color, sometimes brown or black. In composition it consists of almost pure silica, with traces of iron, lime, and alumina. From the earliest times flint has been employed as a fire-producer, especially with a steel implement in the yet familiar form of "flint and steel." Flint enters largely into the composition of fine earthenware, for which purpose it is reduced to powder after it has been calcined and thrown into cold water. See QUARTZ. Floor-moulding is moulding an object on the floor by the process of "bedding in"; or possibly on the floor in flasks, as distinguished from moulding on the bench. The former method is floor-moulding, the latter bench-moulding. See BEDDING IN; ROLLING OVER; BENCH-MOULDER.