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).
Technical data table detailing primary and secondary resistance and secondary milliamps for various magneto models.
| Identifier | ExFiles\Box 4\5\ 05-page229 | |
| Date | 20th December 1921 guessed | |
| -3- Contd. Magneto. (17) Contact breaker flinging speed. (R.P.M.) (18) Primary resistance (ohms). (19) Secondary Resistance (ohms). (20) Secondary m.a. on 100 volts AC~ Hor. Vert. (24) Remarks. Eisemann .68 ohms at 17ºC 2668 at 18ºC. 14.5 5.9 U.S.A. Bosch DUZ.6 .40 " at 18ºC 3200 at 12ºC. 11.9 8.1 U.S.A. Bosch ZR.6 .345 " at 19ºC 3230 at 18ºC. 11.9 7.2 Watford EOG .53 at 15ºC 2800 at 16ºC 15.5 10.3 Watford ELC6. .73 at 18ºC 3980 at 20ºC 9.9 8.2 | ||