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1. APPARATUS FOR DETECTING THE PARTIAL PRESSURE OF OXYGEN IN AN ATMOSPHERE CONTAINING SULPHUROUS COMPONENTS, COMPRISING A FIRST ENCLOSED CHAMBER HAVING AS A GASEOUS INLET A FIRST GASEOUS PERMEATING ELEMENT WHICH WILL PASS OXYGEN AND EXCLUDE THE SULPHUROUS GASES, SAID CHAMBER BEING ARRANGED FOR EXTENSION INTO THE ATOMSPHERE, A SECOND ENCLOSED CHAMBER POSITIONED WITHIN SAID FIRST CHAMBER AND HAVING A GASEOUS INLET FORMED OF A SILVER ELEMENT WHICH HAS A HIGH SELECTIVE PERMEABILITY OF OXYGEN, AND COUPLING MEANS ARRANGED FOR CONNECTING SAID SECOND CHAM-
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1. APPARATUS FOR DETECTING THE PARTIAL PRESSURE OF OXYGEN IN AN ATMOSPHERE CONTAINING SULPHUROUS COMPONENTS, COMPRISING A FIRST ENCLOSED CHAMBER HAVING AS A GASEOUS INLET A FIRST GASEOUS PERMEATING ELEMENT WHICH WILL PASS OXYGEN AND EXCLUDE THE SULPHUROUS GASES, SAID CHAMBER BEING ARRANGED FOR EXTENSION INTO THE ATOMSPHERE, A SECOND ENCLOSED CHAMBER POSITIONED WITHIN SAID FIRST CHAMBER AND HAVING A GASEOUS INLET FORMED OF A SILVER ELEMENT WHICH HAS A HIGH SELECTIVE PERMEABILITY OF OXYGEN, AND COUPLING MEANS ARRANGED FOR CONNECTING SAID SECOND CHAM-
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