Stocks, hard, sound, well-burnt bricks, used for all ordinary purposes.
Hard Stocks, sound but over-burnt, used in footings to walls and other positions where good appearance is not required.
Shippers, sound, hard-burnt bricks of imperfect shape. Obtain their name from being much used as ballast for ships.
Rubbers or Cutters, sandy in composition and suitable for cutting with a wire saw and rubbing to shape on the stone slab.
Grizzles, sound and of fair shape, but under-burnt; used for inferior work, and in cases where they are not liable to be heavily loaded.
Place-bricks, under-burnt and defective; used for temporary work.
Chuffs, cracked and defective in shape and badly burnt.
Burrs, lumps which have vitrified or run together in the burning; used for rough walling, garden work, &c.
Pressed bricks, moulded under hydraulic pressure, and much used for facing work. They usually have a deep frog or hollow on one or both horizontal faces, which reduces the weight of the brick and forms an excellent key for the mortar.
Blue bricks, chiefly made in South Staffordshire and North Wales. They are used in engineering work, and where great compressional resistance is needed, as they are vitrified throughout, hard, heavy, impervious and very durable. Blue bricks of special shape may be had for paving, channelling and coping.