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 contact breaker timing and primary point gap settings.
| Identifier | ExFiles\Box 65\3\ scan0024 | |
| Date | 26th May 1927 guessed | |
| -5- W (14) Secondary milliamps :- Maximum :- 11.0 Minimum :- 5.3. (15) Primary point gap after previous tests :- .012". Primary point gap .016". Contact breaker timing. | | Make. | Break. | |---|---|---| | A | -26.5° | 94.5° | | R | 24.5° | 14.5° | | | Retard. | Advance. | |---|---|---| | Make. | 26° | -26° | | Break | 145° | 94° | | Make. | 203° | 153° | | Break. | 325° | 275° | Meke ratio :- .670. Primary point gap :- .008". Contact breaker timing. | | Make. | Break. | |---|---|---| | A | -29.5° | 99.5° | | R | 21° | 150° | | | Retard. | Advance. | |---|---|---| | Make. | 23° | -29° | | Break | 150° | 98° | | Make. | 199° | 150° | | Break | 330° | 281° | Meke ratio :- .717. Average variation of break = ±2.5° Contd. | ||