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142 the Chinese Naval Colleges. Admiral Chen has been specially proficient in mathematics, having invented the angle trisector, which is used in the solution of cubic equations. He has taught mathematics in the Normal school, the High Normal and the Technical College, Peking. For distinguished work in the navy, the Chinese government made him a captain in 1914 and a Rear-Admiral in 1924. Admiral Chen is at present Director of the Shanghai College, Chiaotung Ta Hsu University.