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 secondary milliamps, primary point gap, and contact breaker timing.
| Identifier | ExFiles\Box 65\3\ scan0080 | |
| Date | 3rd September 1927 guessed | |
| -6- (14) Secondary milliamps :- Maximum :- 20.0 Minimum :- 5.7 (15) Primary point gap after previous tests :- .010" Primary point gap .014" Contact breaker timing. Make. Break. Retard. Advance. A -2° 94.5° Make. 57° -3° R 58° 154.5° Break. 154° 94° Make. 239° 179° Break. 335° 275° Make ratio :- .536 Primary point gap :- .006" Contact breaker timing. Make. Break. Retard. Advance. A -3° 99° Make. 56° -4° R 57° 159° Break. 159° 99° Make. 238° 178° Break. 339° 279° Make ratio:- .567 Max average variation in break timing = 1° | ||