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).
List of magnetos and their specifications for the 40/50 chassis.
| Identifier | ExFiles\Box 48\2\ Scan251 | |
| Date | 18th March 1925 | |
| X8796 18.3.25. MAGNETOS ON 40/50 CHASSIS. 49-GB. Magneto No.73958. Bakelite gear wheel and alum. distributor. 5-EX. " No.73956 " 98-NK " No.70037. 60° range negative rotation. 44-PK. Magneto No. 60° range - negative rotation. R's ignition relay advance. 46-PK. Magneto No.78324. " 93-NK. Magneto No.78386. " EFC. {E. Fowler Clarke - Electrical Engineer} | ||