aero engines, mounted in test stands, being test run, c 1918.

The Britannia Tubular Bridge, Wales, c 1850.

Three miniature platinum resistance thermometers, 20th century.

Giesl Ejector Tests at Rugby Locomotive Testing Station 1959.

Early electromagnetic engine, mid-19th century.

Orville Wright flying a glider at Kitty Hawk, North Carolina, USA, 10 October 1902.

The Wright Brothers' modified third glider in flight, 1902.

Ringwood and Romsey, Hampshire, 1910s.

Platinum resistance thermometer, 1994.

Testing 'King Edward VII' locomotive at the Locomotive Testing Plant, Swindon. (NRM, NRM_1477/85).

Constructing the test piece for the Difference Engine No 2, 1990.

Constructing the test piece for the Difference Engine No 2, 1990.