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 comparing the volt-speed curves of various ignition coils under specific test conditions.
| Identifier | ExFiles\Box 163\7\ img247 | |
| Date | 10th February 1939 | |
| VOLT - SPEED CURVES OF IGNITION COILS R.R. DOUBLE BREAKER DISTRIBUTOR .75 MAKE RATIO 12 VOLTS SUPPLY D.B. 358 CAM 18OZS SPRING PRESSURE CONTACT VIBRATING CONTACTS CLOSED DELCO - REMY ULTRA HIGH SPEED COIL R.R. EXPL. HIGH SPEED COIL & BALLAST R.R. STANDARD COIL & BALLAST SECONDARY LOADED SECONDARY VOLTS MEGOHM LOAD DISTRIBUTOR SPEED (R.P.M) R.W.S 10/2/39 | ||