German Fighter Pilot’s Oxygen Demand System - Dräger
Date of manufacture:
This is an oxygen demand valve mechanism that uses a flexible rubber bag as both reservoir and actuating mechanism. A pair of hinged paddles within the bag sense when the bag begins to empty and permit cylinder oxygen to enter. As the bag fills, the valve closes providing the demand flow characteristic.The outer cage is to prevent external forces from interfering with the mechanism.
Note manufacture date 16 November 1938. German fighter pilots had oxygen available to them at the start of WWII. British fighter pilots were originally disadvantaged because this device gave German aircraft a higher service ceiling.