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 | ||
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).