calcar i oust

See calcareous. calcar one (kal-ka-rō'ne), n.; pl. calcar on i (-nē). [It. dial., aug. of calcar a, a kiln.] A kiln of simple construction used for obtaining sulphur from its ores. It has a base sloping to an outlet where the melted sulphur may flow out. The sides are made of ma es of gypsum. The kiln is filled with sulphur ore which is heaped above the side walls and covered with burned-out ore. The sulphur ore is then lighted at the top, and the heat of combustion gradually melts the sul phur throughout the kiln. The melted ma runs off through the outlet at the base.