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 primary point gap, contact breaker timing, and automatic advance characteristics.
| Identifier | ExFiles\Box 65\3\ scan0062 | |
| Date | 23th August 1927 guessed | |
| -2- (4) Primary point gap :- .010" Contact breaker timing :- | | Make. | Break. | |---|---|---| | A | -8º | 92.5º | | R | 51º | 151.5º | Range :- 59º | | Retard. | Advance. | |---|---|---| | Make. | 51º | -8º | | Break. | 151º | 92º | | Make. | 231º | 172º | | Break. | 332º | 273º | Make ratio:- .558 (5) Automatic advance characteristics :- | | Speed. | Degrees advanced. | |---|---|---| | Hand range: | | | | Auto range :- | | | | Total :- | | | Contd. | ||