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).
Test report comparing engine detonation, speed, and roughness with different governor and head configurations, including waveform graphs.
| Identifier | ExFiles\Box 101\2\ scan0145 | |
| Date | 28th June 1938 guessed | |
| [Left Margin] 16° ADV BTDC [Table Headers] | | 5-90 MPH | 5-70 MPH | MAX SPEED | DETONATIONS FADE OUT | INTENSITY OF DETONATIONS [Row 1] STD GOVERNOR | TURB HEAD | 15.9 | 95.3 | 75.0" | 20" | LOUD. [Row 2] | DETURB HEAD | 15.55 | 93.15 | 77.0" | 15" | LOUD. [Row 3] SPECIAL GOVERNOR | TURB HEAD | 15.9 | 96.8 | 75.0" | 12" | LOUD. [Row 4] I. WALLER | DETURB HEAD | 17.3 | 99.95 | 75.5 | 12" | MEDIUM LOUD [Row 5] SPECIAL GOVERNOR | TURB HEAD | 16.3 | 97.6 | 75.2 | 14" | LOUD [Row 6] H F HAMILTON. | DETURB HEAD | 16.05 | 99.35 | 77.5 | 16" | LOUD. [Right Margin - Vertical] ROUGHNESS FROM 5MPH IN TOP 1° | ||