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 showing the volt-speed curves of various ignition coils under specific test conditions.
| Identifier | ExFiles\Box 163\7\ img248 | |
| Date | 10th December 1934 | |
| CONTACTS CLOSED DELCO-REMY ULTRA HIGH SPEED COIL R.R. EXPL. HIGH SPEED COIL & BALLAST CONTACT VIBRATING R.R. STANDARD COIL & BALLAST VOLT-SPEED CURVES OF IGNITION COILS R.R. DOUBLE BREAKER DISTRIBUTOR .75 MAKE RATIO. 12 VOLTS SUPPLY DB.{Donald Bastow - Suspensions}358 CAM. 13 OZ.S SPRING PRESSURE O.C. SECONDARY VOLTAGE DISTRIBUTOR SPEED (R.P.M.) SECONDARY OPEN-CIRCUITED R.M.S / 10/12/34 | ||