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 advance curves obtained for an oil relay ignition governor.
| Identifier | ExFiles\Box 65\1\ scan0028 | |
| Date | 15th December 1924 | |
| OIL RELAY IGNITION GOVERNOR IGNITION ADVANCE CURVES OBTAINED FLYWHEEL IGNITION ADVANCE ° 60° 50° 40° 30° 20° 10° 0° ENGINE R.P.M. 1000 2000 3000 A B S A.{Mr Adams} CURVE OBTAINED WITH WEAK SPRING 1.LB 5 1/2oz AT 91° B. CURVE OBTAINED WITH STRONG SPRING 70% STRONGER S. SPECIFIED CURVE 15/12/24 | ||