From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Laboratory report on the chemical composition and physical properties of special metal piston rings from Stubbs Limited.
| Identifier | ExFiles\Box 37\2\ scan 162 | |
| Date | 18th October 1917 | |
| X. 3185. 18 th October. 1917. Laboratory. PISTON RINGS IN SPECIAL METAL FROM MESSRS. STUBBS LIMITED. Suggested specification. .35 to .6 Combined carbon. 0.52 Not more than 3.0 Graphite. " 2.90 .7. to 1.2 Manganese. 0.30 1.3 to 2.3 Silicon. 2.37 Nil. Titanium. 0.09 .06 to .12 Sulphur. 0.05 .5 to .8 Phosphorus. 0.12 Chromium and nickel nil. The sample ring was not better than usual in grain, or noticeably more elastic. The manganese too low and the phosphorus too low also. The sulphur and silicon are not ideal. (Sgd) HCH. | ||