Iron lung machine, 1953.

Profesor Drinker with an iron lung, c 1928.

Iron lung display, 1950s.

Bellows pump for operating an iron lung, c 1950s.

An Iron Lung made in the 1950s.

Iron lung made in the 1950s.

'Iron lung', 22 November 1938.

'Beaver' anaesthetic ventilator, 1955.

Spirometer, 1876-1900.

Spirometer, 1876-1900.

'Iron Works, Colebrook Dale', 1805.

Laennec's stethoscope, c 1820.