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).
Page detailing electrical resistance and current measurements for different magnetos.
| Identifier | ExFiles\Box 48\2\ Scan093 | |
| Date | 9th May 1924 | |
| Contd. -10- EFCl/T9.5.24. (18) & (19) Primary and secondary resistances. 1st. Scintilla. .31 ohm at 18.5°C and 11940 ohms at 20.5°C 2nd. " .32 ohm and 12000 ohms at 16.5°C. EO6 Watford .53 ohm and 2800 ohms at 16°C. (20) Milliamperes taken by secondary windings at 108 volts A.C. 50 ~ were as follows :- Magneto. Armature in position Armature in position of permanent magnet of minimum permanent induced flux. (max.). magnet induced flux. 1st Scintilla. 3.5 1.0 2nd. " 3.9 1.9 Watford EO6. 15.5 10.3 EFC. {E. Fowler Clarke - Electrical Engineer} | ||