Clark, THOMAS

Clark, THOMAS, chemist, was born at Ayr in 1801, and studied at Ayr Academy. He became a chemist in Glasgow, lectured on chemistry there, and in 1833 became professor at Marischal College, Aberdeen. He fell into ill-health in 1843, and died 27th November 1867. His name is specially remembered for his discovery of the soap-test for hardness in waters, and his method of softening water by means of caustic lime. See WATER.