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 a sleeve magneto, detailing primary point gap and contact breaker timing angles.
| Identifier | ExFiles\Box 48\2\ Scan337 | |
| Date | 23th November 1925 guessed | |
| -2- Contd. (4) Primary point gap :- .012" Sleeve and contact breaker timing.:- Sleeve advance angle :- +30° Sleeve retard " : - 33° Contact breaker angles in relation to sleeve:- Make. Break. -96° 61° 84° 240° Av. -96° 60.5° Range :- 63° Make ratio :- .87 (Special page for sleeve magneto with no automatic advance). | ||