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 results page showing secondary milliamps, primary point gap, and contact breaker timing data.
| Identifier | ExFiles\Box 48\2\ Scan260 | |
| Date | 26th March 1925 guessed | |
| -5- (14) Secondary milliamps :- Maximum :- 19.3 Minimum :- 9.6 (15) Primary point gap after previous tests :- .012" Primary point gap .014" Contact breaker timing. | | Make. | Break. | |------|--------|---------| | A. {Mr Adams} | -68° | 81.5° | | R. {Sir Henry Royce} | -5.5° | 144° | | | Retard. | Advance. | |-------|---------|----------| | Make. | -6° | -68° | | Break.| 143° | 81° | | Make. | 175° | 112° | | Break.| 325° | 262° | Make ratio:- .831 Primary point gap :- .010" Contact breaker timing. | | Make. | Break. | |---|-------|--------| | A | -67° | 84° | | R | -5° | 146° | | | Retard. | Advance. | |-------|---------|----------| | Make. | -5° | -67° | | Break | 145° | 83° | | Make. | 175° | 113° | | Break | 327° | 265° | Make ratio:- .839 | ||