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).
Instruction to manufacture specific Wraith III engine parts from Low Carbon Case Hardening Steel.
| Identifier | ExFiles\Box 6\6\ 06-page183 | |
| Date | 2nd April 1937 | |
| SECRET 600 E/PSN.1/MM.2.4.37. To HFS. Copy to BY.{R.W. Bailey - Chief Engineer} RMC. Da.{Bernard Day - Chassis Design} Rm.{William Robotham - Chief Engineer} BY/EM. -------------------------- Wraith III Engine Parts in Low Carbon Case Hardening Steel. Will you please make the camshaft EF.918, and the balancing cam EF.921 of the third Wraith engine in Low Carbon Case Hardening steel as agreed with Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls} Will BY/EM please arrange that the material is available. Further engine parts will be instructed for test on the third engine in this material as the detail drawings become available. E/PSN. | ||