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).
Diagram illustrating the action of Falcon X triple valve springs just below bouncing speed.
| Identifier | ExFiles\Box 43\3\ Scan119 | |
| Date | 12th January 1927 guessed | |
| FALCON X VALVE SPRINGS ACTION OF THE TRIPLE SPRINGS JUST BELOW THE SPEED OF BOUNCING START TO OPEN FULL OPEN DIAGM. SHEWING HOW THE COILS OF THE SPRING BUNCH TOGETHER AT THE ENDS ACE/S | ||