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THIS paper is an elementary nonmathematical discussion of the essential thermal processes of gas turbines with emphasis on turbine types suitable for use in vehicles. A brief history is followed by discussion of the limitations imposed by strength of materials. The effects of pressure ratio, compressor and turbine efficiency, turbine inlet temperature, and atmospheric temperature upon output and thermal efficiency, are discussed., The effects of regeneration upon thermal efficiency at full and part load, with particular emphasis upon the latter, are discussed, and the regenerator is stated to be essential to obtain acceptable fuel mileage in vehicle use. The probable performance parameters of a vehicle turbine of about 200 rated hp are explored.