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 diagram illustrating a fracture on a broken lever.
| Identifier | ExFiles\Box 12\1\ 01-page098 | |
| Date | 13th November 1928 guessed | |
| LEVER BROKEN RETURN TO H.I.C. CONTROL IGNITION ARROW INDICATES POSITION OF FRACTURE STRAIGHT THROUGH AND CLOSE TO WOODRUFF KEY. | ||