Micro-examination report on a failed Phantom III valve spring and a satisfactory Bentley valve spring.
| Identifier | ExFiles\Box 158\4\ scan0139 | |
| Date | 1st April 1937 | |
| Micro-Examination Report. 1360 M.1299. To Rm. {William Robotham - Chief Engineer} / Swdl. {Len H. Swindell} HL.6/AG.1.4.37. Laboratory. Re: VALVE SPRINGS. (Your ref: Rm {William Robotham - Chief Engineer} /Swdl. {Len H. Swindell} 7/AP.25.3.37) The two springs examined have been examined :- Phantom III Spring. S/CV. This contained a seam 0.013" in depth and oxide-filled which would definitely be present in the wire before coiling, and accounts for the failure. All the other usual tests were applied, and to these the spring gave a satisfactory response. Bentley Spring. "Swedish O {Mr Oldham} /H & T". This has been tested for bend, fracture, hardness, decarburisation, surface defects, structure, etc. but we could find nothing wrong with the material or treatment. HL. / He. | ||
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).