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).
Page 2 of a document concerning measurements in thousandths on a diameter.
| Identifier | ExFiles\Box 146\5\ scan0328 | |
| Date | 20th April 1940 guessed | |
| -2- THOUSANDTHS ON DIAMETER. Rm{William Robotham - Chief Engineer}/Hardy. ROYCAR. | ||