Operating the Victoria Telephone Exchange, 1921.

Edwin Hall, American physicist, c 1920.

Stalybridge no 2 signal box (Horwich, HOR_ST_6).

Napier's Rods, 1671-1700.

Attendant filliing teacup with boiling water from urn on trolley, 19 April 1921.

The Great Bear Locomotive. England.

Mathematical models, early to mid 18th century.

Glas bubbles for testing proof spirits, c 1840-1850.

Glas bubbles for testing proof spirits, c 1840-1850.

Set of stomach pumping instruments, London, 1860-1870.

Clock symbolising motive power, French, 19th century.

Clock symbolising motive power, French, 19th century.