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 sleeve and contact breaker timing for a magneto.
| Identifier | ExFiles\Box 57\2\ Scan158 | |
| Date | 23th December 1926 guessed | |
| -2- Contd. (4) Primary point gap :- .012" Sleeve and contact breaker timing:- Sleeve advance angle :- +30° Sleeve retard :- -30° Contact breaker angles in relation to sleeve:- | Make. | Break. | |----------|--------| | -35° | 94° | | 145° | 274° | | Av. -35° | 94° | Range :- 60° Make ratio:- .717 (Special page for sleeve magneto with no automatic advance). Contd. | ||