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 showing micrographs of the transverse sections of three different springs, noting the levels of decarburisation on their upper surfaces.
| Identifier | ExFiles\Box 154a\4\ scan0063 | |
| Date | 7th December 1937 guessed | |
| ROLLS-ROYCE LABORATORY REPORT: Transverse section of Woodhead's spring No.24. - partial decarburisation in region of upper surface. M.1486/3 x 250 Transverse section of Firth's spring No.1. - complete decarburisation and oxide in upper surface. M.1486/4 x 250 Transverse section of American spring - complete decarburisation of upper surface. M.1486/5 x 250 | ||