Abstract: This invention proposes a partial pressure jerkin that includes a front panel and a rear panel to overlie the anterior and posterior region of the trunk respectively of a wearer. The front and rear panels are joined at selected areas of their periphery to provide head, arm and leg apertures. An opening is formed in the rear panel extending from the head aperture to one of the leg apertures to permit access to the garment and a zip fastener is provided to close the opening. A single bladder is attached to the inside of the outer garment and is positioned between the front panel and the chest of the wearer. The bladder extends between the head and arm apertures to terminate in a region adjacent to the shoulder blades of the wearer and covers the anterior portion of the trunk all the way down to the upper thighs and inguinal areas.

Abstract: A breathing mixture controller is provided for use with oxygen generators and consists of a sensing means adapted to receive a portion of the breathing mixture and to sense the partial pressure of oxygen in the breathing mixture at cabin pressure, an aneroid controlled valve positioned in the flow to cut off the flow at higher altitudes, and a valve coupled to the sensing means for controlling the flow dependent upon the partial pressure of oxygen in the breathing mixture.