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 material analysis and hardness testing of a Phantom III Front Spring.
| Identifier | ExFiles\Box 95\3\ scan0198 | |
| Date | 24th December 1935 | |
| x 346 To BY.{R.W. Bailey - Chief Engineer} E.{Mr Elliott - Chief Engineer} Hs{Lord Ernest Hives - Chair}/Les.{Ivan A. Leslie} HL2/AG.24.12.35. Laboratory. Report No.L.4014. Re: Phantom lll Front Spring G.83271. No.6 Spring has been analysed and found to be Silico Manganese steel, with a Brinell hardness figure of 515. Hl. lH{Mr Haworth} | ||