Grain Mortar

Grain Mortar

 

an implement for milling grain by hand. It consists of two stones—a lower stone with a flat, slightly concave surface and an upper one, smaller and rounded. The grain is poured into the lower stone and ground by the upper one. Grain mortars appeared in the early Neolithic period and were used until the invention of round millstones in the fourth and third centuries B.C. Grain mortars continue to be used among some peoples of Africa, Australia, and Central America.

References in periodicals archive ?
300 m 2 natural stone type such as floors and stairs inside, floors laying in the railroad track, web width 60 cm, free lengths from 80 to 120 cm, laying on pedestals, outside staircase including sealing and coarse grain mortar, laying with adhesive slurry, incl.
What do grain mortars, evaporated milk tin lids, cassava graters, and railway sleepers have in common?