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).
Specification sheet for contact breaker timing and automatic advance characteristics.
| Identifier | ExFiles\Box 65\3\ scan0020 | |
| Date | 26th May 1927 guessed | |
| -2- W (4) Primary point gap :- .012" Contact breaker timing :- | | Make | Break | |---|---|---| | A | -27° | 96.5° | | R | 23° | 147° | | | Retard | Advance | |---|---|---| | Make | 23.5° | -28.5° | | Break | 147° | 96° | | Make | 201° | 155° | | Break | 327° | 277° | Range :- 50° Make ratio :- .688 (5) Automatic advance characteristics :- Hand range :- Auto range : Total :- Speed. Degrees advanced. Contd. | ||