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 results for Scintilla magnetos detailing automatic advance angles at various speeds.
| Identifier | ExFiles\Box 48\2\ Scan094 | |
| Date | 28th May 1923 guessed | |
| 19.1.23. SCINTILLA MAGNETO AG-6-A. {Mr Adams} (AUTOMATIC ADVANCE) We find this magneto to Commence its automatic advance at 500 r.p.m. (Magneto speeds and advances throughout). Attain an advance of 5° at 1150 r.p.m. " " " " 12° at 1620 r.p.m. " " " " 18° at 2000 r.p.m. " " " " 24° at 2420 r.p.m. and the maximum amount of 32° at 3600 r.p.m. Hand advance 17.5° Total 50° 30.1.24. SCINTILLA MAGNETO AM-6-A. {Mr Adams} No. 26485. We find this magneto to Commence its automatic advance at 270 r.p.m. Attain an advance of 5° at 800 r.p.m. " " " " 10° at 1160 " " " " " 15° at 1600 " " " " " 20° at 1900 " " " " " 25° at 2250 " " " " " 30° at 2750 " and the maximum amount of 33° at 3300 r.p.m. Hand advance 20° Automatic advance 33° Total advance 53° 31.3.24. SCINTILLA MAGNETO AM-6-A. {Mr Adams} No.34937. We find this magneto to Commence its automatic advance at 420 r.p.m. Attain an advance of 5° at 850 r.p.m. " " " " 10° at 1160 r.p.m. " " " " 15° at 1600 " " " " " 20° at 1850 " " " " " 25° at 2180 " " " " " 30° at 2570 " and the maximum amount of 32.5° at 2750 r.p.m. Hand advance 20.5° Automatic advance 32.5° Total advance 53° | ||