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 detailing primary point gap, contact breaker timing, and automatic advance characteristics.
| Identifier | ExFiles\Box 65\3\ scan0163 | |
| Date | 18th January 1928 guessed | |
| -2- (4) Primary point gap :- .012 Contact breaker timing:- | Make. | Break. | |---|---| | A | -11° | 98° | | B | 48° | 158° | Range :- 60° | | Retard. | Advance. | |---:|---|---| | Make. | 45° | -12° | | Break. | 157° | 97° | | Make. | 231° | 170° | | Break. | 340 | 279° | Make ratio :- .61 (5) Automatic advance characteristics :- Hand range:- Auto range :- Total :- | Speed. | Degrees advanced. | |---|---| Contd. | ||