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).
Specifications for primary point gap and contact breaker timing.
| Identifier | ExFiles\Box 40\2\ Scan122 | |
| Date | 10th August 1926 guessed | |
| -2- (4) Primary point gap :- .014" Contact breaker timing :- Make. Break A 3.5° 108° R 59.5° 164° Retard Advance. Make. 60° 4° Break 162° 106° Make 239° 183° Break 346° 290° Range :- 56° Make ratio :- .581 (5) Automatic advance characteristics :- Hand range :- Auto range :- Total :- Speed. Degrees advanced. Contd. | ||