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, primary point gap, and secondary milliamps.
| Identifier | ExFiles\Box 40\2\ Scan148 | |
| Date | 11th October 1926 guessed | |
| -5- (14) Secondary milliamps :- Maximum :- 15.6 Minimum :- 4.0 (15) Primary point gap after previous tests :- ·013" Primary point gap ·009" Contact breaker timing. Make. Break. A -7.5° 103° R 52.5° 163° Retard. Advance. Make. 54° -6° Break 164° 103° Make. 231° 171° Break. 342° 283° Make ratio :- ·614 Primary point gap :- ·017" Contact breaker timing. Make. Break. A -4° 98.5° R 56° 159° Retard. Advance. Make. 58° -2.5° Break 160° 99° Make. 234° 174° Break 338° 278° Make ratio :- ·571 Average variation of break = 2° Contd. | ||