'The Observatory', Cambridge University, Cambridge, 1825.

'The Observatory', Cambridge University, Cambridge, 1825.

Machinery in Motion court, International Exhibition, London, 1862.

Boilers for 'Machinery in Motion' display, International Exhibition, London, 1862.

Steam locomotives at Cambridge Station, August 1958.

Part of a Spectrophotometer, 1938-1939.

Part of a Spectrophotometer, 1938-1939.

Vents with external louvres beside the Photovoltaic array, Buckinghamshire, May 2001.

Royal Institution lecture programme, 1897.

Templates from Crick and Watson's DNA molecular model, 1953.

Templates from Crick and Watson's DNA molecular model, 1953.

Templates from Crick and Watson's DNA molecular model, 1953.