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).
Departmental memo detailing the heat treatment and testing process for valve springs.
| Identifier | ExFiles\Box 80\3\ scan0210 | |
| Date | 4th April 1912 | |
| R.R 475 (50 H) (X 36. 20.2.12) E.P. 1297. ROLLS-ROYCE LIMITED, NIGHTINGALE ROAD, DERBY. TELEGRAMS: "ROYCAR," DERBY. TELEPHONES: 813 (Two Lines). DEPARTMENTAL MEMO. Name of Person addressed: Mr Barrington. DATE: 4.4.12. Subject: Valve Springs. X290 AW3/C4412. In accordance with Mr Royce's memo re Valve Springs we have carried out tests with 3 untreated springs obtained by Mr Nadin from Salters. The springs were hardened and tempered by us and have been handed to Mr Platford for test. The treatment we have given the springs is:- Heat to 750° Cent., quench in oil, afterwards temper in oil bath to 250° Cent. I have asked Mr Nadin to get a further quantity of valve springs untreated, so that we can carry our tests further. Auy 24 more recd 18.4.12. This sheet must be filed with the correspondence to which it refers. | ||