THE fundamental requirements of a piston ring which must be fulfilled, if it is efficiently to perform its main function of acting as a seal against the passage of compressed gas between the cylinder and piston, are numerous and exacting.
Oubridge, W.A. (1929), "Aero Engine Piston Ring Design: Practical Considerations Involved in Their Manufacture and Fitting in the Engine to Meet the Needs of Current Practice", Aircraft Engineering and Aerospace Technology, Vol. 1 No. 3, pp. 99-102. https://doi.org/10.1108/eb029122
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