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).
Graph of Make Ratio against Speed (RPM) for a Bosch Distributor with varying breaker gap settings.
| Identifier | ExFiles\Box 61b\4\ scan0172 | |
| Date | 5th September 1932 guessed | |
| [ "X6128", "MAKE RATIO", ".3", ".5", ".7", ".9", "1.0", "SPEED RPM", "250", "500", "750", "1250", "1500", "1750", "2000", "2250", "2500", "BOSCH DISTRIBUTOR", ".016 BREAKER GAP", ".020 BREAKER GAP", ".010 BREAKER GAP" ], | ||