The correspondence comprises 7 letters from W. Winton of the Science Museum; copies of 6 letters from Joseph Needham to Winton; copies of 2 letters from Joseph Needham to Chu Kho-Chen [竺可楨 / Zhu Kezhen / Coching Chu] of Academia Sinica, Peking, arranging the copies; part of a letter from Chu, agreeing that the moulds will be made; copy of a letter from Joseph Needham to Dr. Hsia Nai 夏鼐 / Xia Nai] of Academia Sinica, Peking, reminding him about the moulds; letter from Hsia to Needham; letter from Dr. Huan Hsiang [Huan Xiang 宦鄉] of the Chinese Embassy, London, advising that the moulds have arrived; copy of a letter from Needham to Huan, arranging collection of the moulds; copy of a letter from Winton to C. C. Booth of Mildmay Ironworks, Burnham-on-Crouch, Essex, describing the moulds.