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 minimum advance versus RPM to maintain output for an E.A.C. engine.
| Identifier | Morton\M20.2\ img006 | |
| Date | 31th March 1924 | |
| IGNITION CURVES. MIN ADVANCE TO MAINTAIN OUTPUT. E.A.C. ENGINE. Y-AXIS: DEGREES ADVANCE Values: 55, 50, 45, 40, 35, 30, 25, 20, 15 X-AXIS: REVS/MIN. Values: 800, 1000, 1500, 2000, 2500 CURVES: BATTERY ONLY MAG ONLY BOTH IGN'S QHx Tanner 31-3-24 | ||