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 the ignition advance curve for an ignition relay governor, plotted against engine RPM under extreme working conditions.
| Identifier | ExFiles\Box 65\1\ scan0115 | |
| Date | 20th April 1925 | |
| IGNITION RELAY GOVERNOR. CONTROL SPRING E.73203 CHROME CUP LEATHER ALL BACK-LASH TAKEN OUT OF CONTROLS FLYWHEEL IGNITION ADVANCE POWER MAINTAINED. POWER DROPS 5%. OIL TEMP. 60°-70°C OIL PR.{Percy H. Rose} 25-35 LBS/□" OIL TEMP. 80-90°C OIL PR.{Percy H. Rose} 15-25 LBS/□" IGNITION ADVANCE CURVE WITH ENGINE REQUIREMENTS EXTREME WORKING CONDITIONS. ENGINE R.P.M. 20/4/25 | ||