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).
Blueprint showing a cross-section of a valve and fixed leak piston assembly.
| Identifier | ExFiles\Box 178\4\ img112 | |
| Date | 8th April 1932 guessed | |
| VALVE FIXED LEAK PISTON BENTLEY 8 | ||