Bras clockwork bell, 1761.

Bell in vacuo demonstration, 1761.

Vacuum demonstration equipment built for King George III, late 18th century.

'How to build a two valve set', No 22, Godfrey Philips cigarette card, 1925.

Patent moulded carbon water filter, late 19th-early 20th century.

Patent moulded carbon water filter, late 19th-early 20th century.

Patent moulded carbon water filter, late 19th-early 20th century.

Songsheet of George Leybourne's popular song 'The Telegraph', c 1860.

Drug jar, possibly Persian.

Apparatus used by the chemist Thomas Graham, c 1860s.

Bras stand with two tilting glas flasks, 1761.

Running water from tap, 2004.