Exchequer Standard Troy Weights, 1824.

Air pump with a double barrel, 1876.

Short-beam analytical balance and weights, 1876.

Man holding a carrot in the shape of a 'V' sign, c 1930s.

Iron and steel works near Barrow-in-Furnes, 1867.

Barrel-making at Doncaster works, South Yorkshire, c 1916.

Group of standard weights from around the world.

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

Roman balance and weights, AD 350.

Amulet in the shape of a head, Zairean.

Amulet in the shape of a head, Zairean.

Standard Elizabethan weights, 1558-1582.