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).
Confirming the adoption of 3 1/2% Nickel steel for the rear axle drop forgings.
| Identifier | ExFiles\Box 171\3\ img031 | |
| Date | 3rd January 1920 | |
| To By.{R.W. Bailey - Chief Engineer} from R.{Sir Henry Royce} Copy to CJ. " Bn.{W.O. Bentley / Mr Barrington} COPY. R4/G3.1.20. RE MATERIAL FOR REAR AXLE CASING. With reference to material for rear axle casing, on your suggestion and Mr. Hall's recommendation, I agree that we adopt 3 1/2% Nickel steel for the back axle drop forgings of the central case. R.{Sir Henry Royce} | ||