Two napkin rings, late 1930s.

Napkin rings, late 1930s.

Wheatstone's eccentric ring type electromagnetic engine, 1841.

Wicks rotary typecaster, 1878.

Four tuning forks, c 1841-1930.

Ludlow line type-casting machine, 1955.

Injection mould for Lego bricks, 1988.

Four tuning forks invented by Gardiner Brown, c 1841-1930.

Wheatstone eccentric disc type electromagnetic engine, 1841

Lego bricks, 1996.

'Cast iron vase, Mr Handyside', 1851.

Lead tobacco jar, English, 1750-1850.