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).
The history of Nitrogen Hardening and a new Hykro steel specification.
| Identifier | ExFiles\Box 146\1\ scan0122 | |
| Date | 6th December 1937 | |
| 1245 By.{R.W. Bailey - Chief Engineer} from Rm.{William Robotham - Chief Engineer} Rm{William Robotham - Chief Engineer}8/R.6.12.37. With reference to Sr's note, copy of which you have received - Srl/ET.2.12.37. - , as far as we can remember Aubert & Duval were one of the first people to do Nitrogen Hardening on a large scale. We remember going over there to investigate before Firths were doing anything. We have sent Sr. a copy of the specification of the Hykro steel we are preparing to adopt, for his comments. Rm.{William Robotham - Chief Engineer} | ||