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 different chassis ignition coils.
| Identifier | ExFiles\Box 164\5\ img316 | |
| Date | 25th October 1937 | |
| COMPARISON OF CHASSIS IGNITION COILS L6 - LUCAS COIL IN RR TYPE CASE. LT.1272 - LUCAS COIL IN METAL CASE N.1 - RR COIL TO D.76573 UNFILLED N.3 - SAME AS N.1 BUT IMPREGNATED & FILLED WITH BITUMEN COMPOUND FAULTY COIL - FAILURE DUE TO FRICTION BETWEEN PRIMARY-SECY CONNECTION & INSULATING TUBE CAUSING SECY WIRE TO FRACTURE AXIS LABELS: SECONDARY KILO VOLTS SPARKS / SEC. PLOT LABELS: L6 N.3 LT.1272 N.1 FAULTY COIL | ||