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).
Specification table for various magneto models detailing their electrical resistance and performance data.
| Identifier | ExFiles\Box 4\5\ 05-page305 | |
| Date | 22th September 1924 guessed | |
| 2C. Contd. | Magneto. | (17) Contact breaker flinging speed. (R.P.M.) | (18) Primary resistance (ohms). | (19) Secondary resistance (ohms). | (20) Secondary m.a. on 108 volts 50~ Max. Min. | (24) Remarks. | |------------------------|-------------------------------------------------------|---------------------------------|---------------------------------|----------------------------------------------|-------------------| | Eisemann. | | .68 ohms at 17°C | 2667 at 18°C. | 14.5 5.9 | | | U.S.A. Bosch D.U.Z.6. | | .40 ohms at 18°C | 3200 at 12°C | 11.9 8.1 | | | U.S.A. Bosch ZR.6. | | .345 * at 19°C | 3230 at 18°C | 11.9 7.2 | | | Watford EO6. | | .53 at 15°C. | 2800 at 16°C | 15.5 10.3 | | | Watford ELO6. | | .73 at 18°C | 3980 at 20°C | 9.9 8.2 | | | Scintilla AG-6-A.{Mr Adams} | | -- | -- | - - | | | Scintilla AM-6-A.{Mr Adams} | | .31 at 18.5°C | 11840 at 20.5°C | 3.5 1.0 | + Rotation. | | Scintilla AM-6-A.{Mr Adams} | | .32 at 16.5°C | 12,000 at 16.5°C | 3.9 1.9 | - Rotation. | | Scintilla AM-6-A.{Mr Adams} | | -- | -- | - - | - Rotation. | | Scintilla AC-6-A.{Mr Adams} | | .34 at 13°C | 6375 at 15°C | 5.8 2.1 | - Rotation. | | ||