Elastic band tubing and elastic bands, 1996.

Extrusion die for elastic band tubing, 1965-1975.

Three hydrometers, 1700-1730.

Apparatus for demonstrating the elasticity of a spring or wire, 1762.

Hooke's spring, c 1679.

Laryngeal bougie, late 19th century.

Percusor and pleximeter, 19th century.

Percusor and pleximeter, 19th century.

Sibson type combined percusor and pleximeter, c 1860.

Mercury delay-line store, c 1950.

Inuit fire-stick from the Arctic.

Bamboo opium pipe, 19th century. Bamboo o