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).
Performance data for a single breaker distributor standard coil at different ballast resistances.
| Identifier | ExFiles\Box 168a\5\ img063 | |
| Date | 18th December 1936 guessed | |
| SINGLE BREAKER DISTRIBUTION .550 MAKE-RATIO STANDARD COIL EX1 WITH 1000 lbs. ON THE PRIMARY.B Ballast resistance 1.70 ohms. cold. (Std.) DISTRIBUTOR SPEED RPM. PRIMARY CURRENT SECONDARY VOLTAGE. 400 1.130 16800 800 .905 17600 1200 .752 16700 1600 .640 15200 2000 .579 14000 Ballast resistance 2.02 ohms. cold. DISTRIBUTOR SPEED RPM. PRIMARY CURRENT SECONDARY VOLTAGE. 400 .935 12800 800 .820 12900 1200 .700 14800 1600 .640 14400 2000 .540 13300 Ha/Wat. | ||