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).
Test results for four 45 mm shafts that were run at 2 tons for 250,000 revolutions.
| Identifier | ExFiles\Box 159\6\ scan0041 | |
| Date | 3rd July 1939 | |
| -2- Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls}13/WH.3.7.39. Test (5). Four 45 mm shafts left black, run at 2 tons for 250,000 revolutions. Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls} | ||