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 comparing ignition curves for an E.A.C. engine against Hispano engine curves.
| Identifier | Morton\M20.2\ img005 | |
| Date | 31th March 1924 | |
| IGNITION CURVES. CURVES. 1-2-3. E.A.C. ENG. MEAN POSNS. FOR MAINTAINING OUTPUT. HISPANO CURVES FOR COMPARISON. DEGREES ADVANCE. REVS/MIN. 55, 50, 45, 40, 35, 30, 25, 20, 15. 500, 1000, 1500, 2000, 2500. BATTERY (1) ONLY MAG ONLY (2) BOTH IGNS. (3) HISPANO 1 PLUG HISPANO 2 PLUGS. T.H.T. Cramer 31-3-24. | ||