Robert Koch, German bacteriologist, 19th century.

Vickers-Supermarine Rolls-Royce S6A, Schneider Trophy Programme, 1929.

Hobby horse, c 1818.

Profesional men riding hobby horses, c 1820.

'Hobby horse', c 1818.

'Railway Swing-bridge, Folkestone Harbour', c 1851.

School children being evacuated from London, 28 September 1938.

The first balloon crosing of the English Channel, 7 January 1785.

Bristol Aircraft advertisement, Schneider Trophy programme, 1931.

Three Gordon Bennett Napier motor cars, 1903.

The first balloon ascent with animals, 19 September 1783.

Borda's repeating circle without reflection, 1820.