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 page detailing secondary milliamps, primary point gaps, and contact breaker timing.
| Identifier | ExFiles\Box 57\2\ Scan161 | |
| Date | 23th December 1926 guessed | |
| -5- Contd. (14) Secondary milliamps :- Maximum :- 17.5 Minimum :- 9.4 (15) Primary point gap after previous test :- .010" Primary point gap :- .008 Contact breaker timing. Make ratio .731 | Make. | Break. | | -35° | 96° | | 144° | 276° | AV. | -35.5° | 96° | Primary point gap :- .016" Contact breaker timing :- Make ratio .703 | Make. | Break. | | -33° | 93° | | 146° | 273° | AV. | -33.5° | 93° | (Special page for sleeve magneto). | ||