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).
Test data sheet for sleeve magnetos, detailing secondary milliamps, primary point gap, and contact breaker timing.
| Identifier | ExFiles\Box 48\2\ Scan340 | |
| Date | 23th November 1925 guessed | |
| -5- (14) Secondary milliamps :- Maximum :- 17.1 Minimum :- 10.0 (15) Primary point gap after previous test:- .011" Primary point gap :- .016" Contact breaker timing. | Make. | Break. | | -94° | 58° | | 86° | 237° | | Av. -94° | 57.5° | Make ratio :- .842 Primary point gap :- .008" Contact breaker timing :- | Make. | Break. | | -98° | 64° | | 82° | 242° | | Av. -98° | 63° | Make ratio :- .895 (Special page for sleeve magnetos)‡ | ||