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 of ignition curves for an E.A.C. engine, plotting ignition advance against engine speed for different ignition systems.
| Identifier | ExFiles\Box 37\1\ scan 258 | |
| Date | 31th March 1924 | |
| IGNITION CURVES. MIN ADVANCE TO MAINTAIN OUTPUT. E.A.C. ENGINE. ADVANCE. DEGS. REVS/MIN. BATTERY ONLY MAG ONLY BOTH IGNS. R.H.Yarrow 31-3-24. | ||