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 battery and magneto ignition advance curves.
| Identifier | ExFiles\Box 72\4\ scan0352 | |
| Date | 30th May 1924 | |
| X9780 70° 60° 50° BATTERY IGNITION ADVANCE. (FULLY ADVANCED AUTOMATICALLY) 40° 30° BATTERY IGNITION ADVANCE 30° (FULLY RETARDED AUTOMATICALLY) B.D.P. 20° MAGNETO ADVANCE 10° RETARD. 0° ADVANCE. 10° IGNITION LEVER TRAVEL A.D.P. 20° E.A.C.III BATTERY AND MAGNETO IGNITION DIAGRAM. H.E.W. 29-5-24 E.F.C. 30-5-24 | ||