Bank of England bullion balance, devised by J Barton, 1820.

Copper works, Swansea, 17 July 1931.

100 ounce 'Auctioneers' Plate Valuing' balance and weights, 1901-1902.

Geared roller copper plate printing pres, 18th century.

A copper plate used for instrument maker A Yeates's trade card, c 1800s.

Basic electrical cell, c 1990s.

Edison electrolyte meter, c 1881.

A copper plate used for Cornelius Varley's trade card, c 1800s.

Geared roller copper plate printing pres, 18th century.

Printing plate showing parts of a reversible plough, c 1877-1950.

Tungus style opium pipe, 19th century.

Physionotrace of a man, c 1808