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 results for Redmanol encased ignition coils without failure.
| Identifier | ExFiles\Box 69\1\ scan0040 | |
| Date | 25th September 1926 | |
| X8710 EFC3/T25.9.26. To R.{Sir Henry Royce} from EFC. c. BJ. E.{Mr Elliott - Chief Engineer} c. De. By.{R.W. Bailey - Chief Engineer} c. Wor.{Arthur Wormald - General Works Manager} X.4079c - REDMANOL ENCASED IGNITION COILS. X8710 X.4653 Redmanol encased coils have now completed the following mileages without failure. Date started. Standard type. TR{Capt. F. W. Turner - Finance}1 --- 26,778 miles. 20.12.23. TR{Capt. F. W. Turner - Finance}3 --- 37,447 " 15.2.24. TR{Capt. F. W. Turner - Finance}5 --- 13,108 " 24.9.24. Finer primary coils. GP1 --- 13,994 " 7.9.25. GP2 --- 12,745 " 11.8.25. GP3 --- 6,374 " 19.11.25. GP4 --- 23,167 " 21.11.25. EFC. | ||