<p>Photographs of the Tien Yuan Electro-Chemical Works, Ltd. (Tian yuan dian hua gong chang gu fen you xian gong si 天原電化工廠股份有限公司), which was located in Maoershi 猫儿石, Jiangbeiqu 江北区, Chongqing 重庆市. They were accompanied by a letter dated June 16, 1943 from P.N. Woo to W.V. Blewett at the British Embassy, and a list of captions for the photos. All the photographs were small and stuck onto a sheet of paper. The precise date of Dr. Needham's visit to the Works is not certain.</p> <p>Further information and resources are available about Needham's time in China from 1943-1946 as Director of the Sino-British Science Cooperation Office here [<a target='_blank' class='externalLink' href='http://www.nri.cam.ac.uk/JN_wartime.htm'>link</a>] .</p>