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Smith-Clarke 'Junior' cabinet respirator, Warwick, England, 1956-1970

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Devised in 1956 by George Thomas Smith-Clarke (1884-1960), a British engineer, the Smith-Clarke ‘Junior’ cabinet respirator was a type of iron lung designed for children up to the age of six. First developed to treat gas inhalation victims, iron lungs were subsequently used to treat patients whose chest muscles were paralysed from diseases such as polio. Patients were encased in the cabinet. Air at alternating pressures was pumped into the chamber causing the lungs to inflate and deflate so the person could breathe. Smith-Clarke modelled the ‘Junior’ breathing machine on an iron lung he had developed for adults in the 1950s, known as the Mark II. Unlike the adult version, the ‘Junior‘ version was designed to incorporate the pump and patient chamber as one unit. Smith-Clarke devised a new way of opening and closing both the ‘Junior’ and Mark II versions of the iron lung. Hinged at one end, the machines became known as ‘alligators’, for the way the cabinet mimicked the jaws of the creature. Smith-Clarke models remained popular throughout the 1960s. This example was made by the Cape Engineering Co. Ltd. based in Warwick, England.

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Glossary: iron lung

An airtight cylinder which a person lies in who is unable to breathe. The air pressure is alternatively raised and lowered, producing suction that causes lungs to inflate and pressure that deflates the lungs. This mimics the breathing process.