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).
Chemical analysis report for special metal piston rings from Messrs Stubbs Ltd.
| Identifier | ExFiles\Box 37\2\ scan 160 | |
| Date | 18th October 1917 | |
| R.R. 300 (120 m) (SC. 376. 23.2.16) E.P. 1262. X. 3185 59170 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To: Wd{Mr Wood/Mr Whitehead} Order No.: Customer's No.: Laboratory Re: Piston rings in Special metal from Messrs Stubbs Ltd_ Suggested Specificati- .35 & .6 Combined Carbon 0.52 Not more than 3.0 Graphite 2.90 .75 & 1.2 Manganese 0.30 1.3 & 2.3 Silicon 2.34 nil Titanium 0.04 unusual .06 & .12 Sulphur 0.05 .5 & .8 Phosphorus 0.12 Side note: Chromium & Nickel nil The sample ring was not better than usual - grain or noticeably more elastic the manganese too low & the phosphorus too low also. the sulphur & silicon are not ideal. Signed: HCSP This Sheet must be filed on completion of the work. | ||