Collection of Stewart Johnson Crispin, structural engineer. Comprises lecture notes, drawings, 35mm colour slides, 2 1/4 inches glass slides and typed papers collected and compiled by S.J. Crispin between 1929 and 1985 on various aspects of civil engineering, particularly railways and mining in Cornwall. Includes unpublished surveys of the viaducts and bridges on the Great Western Railway between Paddington and Penzance (main line and branches), c.350 glass slides and c.130 35mm colour slides re Cornwall Railway and aspects of Cornish industrial archaeology.