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 showing the ignition advance curve for an ignition relay governor under extreme working conditions.
| Identifier | WestWitteringFiles\M\2April1925-June1925\ Scan24 | |
| 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/D" OIL TEMP. 80°-90°C. OIL PR.{Percy H. Rose} 15-25 LBS/D" IGNITION ADVANCE CURVE WITH ENGINE REQUIREMENTS. EXTREME WORKING CONDITIONS. ENGINE R.P.M. 20/4/25. | ||