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).
Photograph of a Bentley III No.1 Unit exhaust valve after a test run.
| Identifier | ExFiles\Box 100\3\ scan0013 | |
| Date | 13th December 1938 guessed | |
| BENTLEY III NO.1 UNIT. EW.1853 Exhaust Valve produced in S/SLV - after 52 1/2 hours' running on Test Bed. | ||