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device. We have in fact described a device which meets these reauirements in full.1 The first part, operated by the pressure of the oxygen supply, comes into operation when the oxygen is turned on and cannot be turned off. When the oxygen pressure begins to fall the device sounds a warning, then cuts off other vanours or eases and opens the breathing circunt to atm here. However, after failure little or no air is drawn in because rebreathing occurs to and from the reservoir bag and this coulddoi:10.1136/bmj.4.5885.168-a fatcat:5hbewqauwfffjptwtlw5spj6ey