[Papers (1890-1937) of W.B. Ferguson re his work on photographic sensitometry, negative density measurement, calculation of development times for film, etc. Comprises: 1- personal correspondence and papers; 2- work on photography; 3- Ferguson and the British Sensitometry Standardisation Committee 1925-1937; 4- Ferguson and the British Photographic Research Association; 5- Hurter and Driffield material; 6- Miscellaneous offprints concerned with photography. 3 boxes, listing available]