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 showing the minimum advance required to maintain output for an E.A.C. engine.
| Identifier | ExFiles\Box 182\M20\M20.2\ img006 | |
| Date | 31th March 1924 | |
| IGNITION CURVES. MIN ADVANCE TO MAINTAIN OUTPUT. E.A.C. ENGINE. ADVANCE. DEGREES REVS/MIN. BATTERY ONLY MAG ONLY BOTH IGNS. 9H/Yarrow 31-3-24 | ||