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 point gap, timing, and automatic advance characteristics.
| Identifier | ExFiles\Box 43\4\ Scan243 | |
| Date | 18th February 1930 guessed | |
| -2- (4) Contact breaker point gap :- .013" Contact breaker timing :- | | Make. | Break. | |---|---|---| | A | 8° | 50° | | B | 39° | 80° | | | Retard. | Advance | |---|---|---| | Make | 38° | 7° | | Break. | 80° | 50° | | Make. | 130° | 99° | | Break. | 169.5° | 139.5° | Range :- 30.5° Make ratio :- .461. This magneto gives 4 sparks per revolution. (5) Automatic advance characteristics :- Hand range :- Auto range :- Total :- | Speed | Degrees advanced. | |---|---| | | | | | | contd. | ||