The object was to determine 1 the overall coefficient of heat transfer between ambient air and liquid oxygen in a thin walled tank, 2 the film coefficient between ambient air and a tank of liquid oxygen, and 3 the film coefficient between a tank wall and liquid oxygen. A 0.125 inch 61ST aluminum tank 4 ft. high, 2 ft. in diameter was used to contain the liquid oxygen. The top and bottom of the tank were insulated with 62 inch fiberglass. Investigations were made under three conditions A Average wind velocity normal to tank equal to zero. B Average wind velocity normal to tank equal to 7.1 MPH. C Average wind velocity normal to tank equal to 13.6 MPH. The tank was mounted on a platform scale see Figure2 to measure the oxygen boiloff. The tank was refilled at the start of each test condition. Thermocouples on the inner and outer surfaces of the insulated top and bottom were used to determine the heat influx through these tank areas. Temperature measurements from all thermocuples were taken as often as possible with two Leeds and Northrop null balance poteniometers.