Strapping for mine rescue ‘Proto’ breathing apparatus.

Seven pieces of leather strapping associated with mine rescue ‘Proto’ breathing apparatus by Siebe Gorman and Company Limited, London, 1946-195.

'Proto' self-contained breathing apparatus was manufactured by Siebe Gorman c.1914-1972. It was used by rescue services tasked with responding to underground mining accidents across the UK. The apparatus consisted of a divided rubber breathing bag containing 'Protosorb', which absorbed the carbon dioxide released as the user breathed out, passing the air back through the oxygen supply, therefore making it possible to re-breathe. The apparatus also consists of a metal cooling unit (the absorbent ‘Protosorb’ heating up as it absorbed carbon dioxide), an oxygen cylinder, supply tubes, a nose clip and mouth piece. The whole apparatus was worn by the user on their front, secured with leather straps and a belt.