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).
Graph plotting a curve related to engine timing, showing a closing point and Top Dead Center (TDC).
| Identifier | ExFiles\Box 179\2\ img234 | |
| Date | 8th February 1929 guessed | |
| V 1297 CLOSING T.D.C. | ||