Apparatus for showing the mechanical equivalent of heat, 1884.

Bronze bull weight, Egyptian, c 1500 BC.

Celtic bronze balance beam and lead weight, Isle of Man, 8th century.

Cord pivot, balance and set of weights, ivory, Persian, 16th century.

Two ancient Greek lead weights, c 300 BC.

Egyptian card-pivot, wooden beam balance and weights, 1370-1350 BC.

Thirteen small bronze Elephant weights, 17th-18th century.

Pair of kitchen scales and weights, made in Sweden, c 1880.

Byzantine bronze weights, c 600-699 AD.

Pair of kitchen scales and weights, made in Sweden, c 1880.

Thirteen small bronze Elephant weights, 17th-18th century.

Prehistoric Egyptian limestone balances and weights, 5000 - 7000 BC.