English: Ernest Wollan and Clifford Shull taking data on a double-crystal neutron spectrometer, installed on the south face of the ORNL graphite reactor in 1949.
Photo is from US Atomic Energy Commission or Oak Ridge National Laboratory. Article rights are T. E. Mason et al. 2013 (for Oak Ridge National Laboratory).
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It has been requested to crop a part of this image, so that the cropped part can serve as its own image for Ernest Omar Wollan.