A bundle of notes primarily regarding the regulation of oxygen during flight, including a paper on the 'Functioning of Oxygen System on Pressure Suits with Modified German Demand Regulators' with sketch diagram of design, ground testing notes of RAF Pressure suit equipment, a paper titled 'Factors affecting man when Cabin Pressure is lost at Extreme Altitudes' by Wing Commander H.L. Roxburgh concerning the physiological effects of a lack of oxygen, notes on the environmental requirements in pressurised aircraft, notes on ejecting and parachuting from high altitude, notes on the physiological effects of rapid acceleration, and notes on the selection of flying clothing.