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 performance of a modified ignition coil against the original under different loads.
| Identifier | ExFiles\Box 164\5\ img264 | |
| Date | 9th December 1936 guessed | |
| TEST SHOWING RESULTS OF MODIFICATION TO COIL D/15260. MODIFICATION-SECONDARY WOUND WITH 15000 TURNS OF 42 S.W.G. ENAM. ALSO EMBODYING THE NON-SOLDER METHOD OF START & FINISH OF THE WINDING. (A) MODIFIED COIL 1 MEGHOM LOAD (B) ORIGINAL COIL 1 MEGHOM LOAD (C) MODIFIED COIL 1/2 MEGHOM LOAD (D) ORIGINAL COIL 1/2 MEGHOM LOAD TEST TAKEN WITH Ph.II DISTRIBUTOR & BALLAST RESISTANCE. .73 MAKE RATIO 12 VOLTS SUPPLY H.T. OUTPUT TAKEN FROM DISTRIBUTOR. SECONDARY VOLTS (KILO-VOLTS) SPARKS/sec | ||