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THIS PAPER discusses the Stirling thermal enging from four points of view: 1. The ideal, thermodynamic point of view, showing the inherent potentialities of the ideal Stirling cycle in comparison to the basic cycles of other engines. 2. The physical engine and its method of operation with respect to the ideal cycle and the limitations of practical mechanics. 3. Performance data from the first modern Stirling engines ever operated in the United States, evaluating the relationship between the new engine and other more familiar engines of similar sizes. This comparative discussion serves to demonstrate the advantages and disadvantages of the Stirling engine and to indicate its proper place in the 1960 family of prime movers. 4. A look backward into the century of history behind the modern engine pointing out significant milestones in the engine's development.