Folder C.149. Printouts, contour maps, density sheets, calculations, lattices, graphs, ideas for structure etc., some dated November 1950, July 1951. Folder C.150. "Fly's eye work Manchester 1952". Notes, graphs, lattices, photographs, some dated May 1952, using optical diffraction methods developed by H.S. Lipson. Folder C.151. "Inequalities. 'Manual' application of Cochran's rule". Notes, graphs, calculations, adaptation for EDSAC program etc. (only one set dated 25…