Abstract: Metal strip is made by heating a workpiece to an elevated temperature, wrapping it around a substantial arc of a first roll, positioning a second roll with respect to the first roll to provide a roll pass therewith at the exit end of the wrap, positioning a third roll with respect to the second roll to provide a second roll pass to give the desired strip thickness with the workpiece engaging a substantial arc of the second roll between the roll passes, the arc of wrap around each of the first and second rolls being less than 90.degree.. The second roll is rotated at a peripheral speed substantially greater than that of the first roll and the third roll is rotated at a peripheral speed at least as great as that of the second roll. A ferrous base hot rolled strip having a width of at least 20 inches, a maximum thickness of 0.04 inches and a length of at least 80 feet is obtainable by this method.

Abstract: Fuels, such as gasoline, are oxidized in a combustion chamber, such as an automobile engine, with a substantial reduction in the amount of toxic materials (nitric oxide, carbon monoxide and unburned hydrocarbons) formed. A mixture of oxygen and inert gases combine with the gasoline in a proportional mixer, the amount of nitrogen not exceeding 70% by weight of the mixture. In the preferred embodiment the oxygen is supplied partially from air and partially from a separate oxygen tank while the inert gases are partially the nitrogen from the air and the remaining exhaust gases from the engine.