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).
The mileage test of a Redmanol encased coil on a 40/50 car.
| Identifier | ExFiles\Box 45\4\ Scan275 | |
| Date | 8th January 1925 | |
| EFC. X4079b 8.1.25. X.4079b. REDMANOL ENCASED COIL TR.{Capt. F. W. Turner - Finance}3. It might be of interest to state that the above coil has now completed 18,100 miles (15,000 in France) on a 40/50 car (98-NK) without suspicion of failure. HEW. | ||