Historical Photographs of China reference for this set: Nh02. Northwest Journey 西北之旅.
A triangulation tripod on top of a section of the
Great Wall near Shantan (Shandan) 山丹, Kansu (Gansu) 甘肅
Photographs from the collection may be reproduced only with written permission. For permissions, contact the Librarian, East Asian History of Science Library, Needham Research Institute. Further information about the library and the ‘Joseph Needham Photographs – Wartime China, 1943-1946’: http://www.nri.cam.ac.uk/JN_wartime_photos/home.htm