Model of Richard's steam engine indicator and gear, made in the Museum workshop for attachment to the model of the Corliss engine, scale 2 inches to 1 foot

Airspeed Indicator Mk IVA, No. 52699

Gee Indicator Type 62, RAF Stores Ref No. 10Q/1300, serial number G24417, for Gee Mk II radio navigational aid

H2S Indicator Unit, Design 1, AP 5423, serial number CL106, for radar navigation and blind bombing, developed for the RAF in 1942

Indicator, part of a Wheatstone A.B.C. telegraph instrument, receiver