A selection of hydrometers, c 1870.

Planimeter, Swis, 1894.

Soroban Japanese abacus, 2001.

Simulation of a Higgs boson decaying into four muons, CERN, 1990.

Leclanche cell made by Ever Ready, 1957.

Sections of tramway, 1815.

Tower of London standard yard rod, 1659.

Japanese abacus from the Japanese Chamber of Commerce and Industry, 1996.

German Fokker E III Monoplane, 1915.

Four-way sand glas, Italian, 17th century.

Four-way sand glas, Italian, 17th century.

Four-way sand glas, Italian, 17th century.