Photograph of Bentley main bearings after 9.5 hours of running on a test rig.
| Identifier | ExFiles\Box 115\3\ scan0262 | |
| Date | 18th July 1938 guessed | |
| BENTLEY MAIN BEARINGS AFTER 9 HOURS 30 MINUTES RUNNING ON TEST RIG. BENTLEY MAIN BEARINGS. After 9 1/2 Hours' Running on Test Rig. | ||
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).