TILLMAN, Samuel Dyer, lawyer, born in Utica, New York, 1 April, 1815; died in New York city, 4 September, 1875. He was graduated at Union in 1834, and then studied law in Canandaigua, where he was admitted to the bar. Several years later he settled in Seneca Falls, New York, where he continued in the practice of his profession, and also was repeatedly elected president of the town council. About 1850 he retired from legal practice and settled in New York city. He was soon elected a member of the American institute, by which organization he was made professor of science and mechanics. Later he became its corresponding secretary and edited the "Transactions" of the institute, published by the state. Professor Tillman's knowledge in every depart-meat of science was extensive. He invented a rotating planisphere to serve as a substitute for the artificial globe, for the use of schools, and also a revolving musical scale, called the tonometer, designed to illustrate the theory of temperament and exhibiting visibly the relations between the true and tempered notes in every key. The degree of Ph. D. was conferred on him by Union college in 1875, and he was a member of various scientific societies, including the American association for the advancement of science. His writings were chiefly essays on technical subjects, and included "A Treatise on Musical Sounds and an Explanation of the Tonometer" (New York, 1860).