Ts'en, Mong-Kang.-Born in Chungking, Szechuen, 1887. Mar-ried, 1916. Graduated from Kwang-Yee Middle School, Chungking, 1907. Teacher: Kwang-Yee Middle School at Chungking, 1907-8; at Chengtu, 1908-9. Arrived in America, September, 1910. Government support. Studied Mechanical Engineering at Cornell University, 1910-14; Electrical Engineering at Union College, 1914-15. M.E., 1914; M.S., 1915. Elected to Tau Beta Pi, May, 1913; to Sigma Chi, May, 1915. Member, Cornell Cosmopolitan Club, 1910-13. Vice-President, Cornell Chinese Students' Club, 1914. Assistant in Electric Laboratory, Union College, 1915-16. Invented Geometrical Slide Rule and Complex Quantity Computer, 1914. Assistant to the Assistant Chief Engineer, New York Edison Co., 1915. Returned to China, January, 1916. Teacher, Kwang-Yee Middle School, Chungking, 1916. Member and Committee, International Friends' Institute, 1916.