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Drummond (HENRY a Scotch geologist)

HENRY, a Scotch geologist and religious writer; born in Stirling in 1851. He studied theology at Edinburgh University. In 1877 he was appointed Professor of Natural Science DRUMMOND ISLAND in the Free Church College, Glasgow. "Natural Law in the Spiritual World" (1883), and its successor "The Ascent of Man," applications of modern scientific methods to the immaterial universe, made his popular fame. He traveled in central Africa (1883-1884) studying its botany and geology, and later wrote "Tropical Africa" (1888). Other semireligious writings of his are: "Pax Vobiscum" (1890); "The Greatest Thing in the World" (1890); "The Programme of Christianity" (1892). He died in Tunbridge Wells, England, March 11, 1897. ✓ DRUMMOND, THOMAS, a Scotch scientist; born in Edinburgh in 1797.

During his professional training at Woolwich and Chatham he showed high mathematical and mechanical abilities, with aptitude for the practical application of scientific principles. In 1920 he was an assistant in the trigonometrical survey of the United Kingdom. The incandescence of lime having been brought under hiş notice at a lecture on chemistry, he istry, he made experiments, and the result was the Drummond Light, noticed in the "Philosophical Transactions" (1826). He invented a heliostat or reflecting mirror, described in the same paper. Experiments for adapting his light to lighthouses are detailed in the "Philosophical Transactions" (1830). In 1835 he went to Dublin with Lord Mulgrave as under-secretary for Ireland. He died in Dublin, April 15, 1840.