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).
Testing of experimental 20 HP ignition coils fitted with new Redmanol cases.
| Identifier | ExFiles\Box 45\4\ Scan171 | |
| Date | 17th July 1923 | |
| To Hs{Lord Ernest Hives - Chair}/TMW. from EFC. X4079 EFC5/T17.7.23. X.4079 - 20 H.P. IGNITION COILS Herewith coil 5TG3 which has been fitted up in a new Redmanol case, so that this is now an experimental coil and needs a special heat test in position. Would you kindly have this coil put on chassis 7-G.II and the stabalite coil at present on that chassis returned to us. Also please let us have 3TG3 coil taken from chassis G.1, which coil I understand is in your possession. All the tall coils are now to be fitted with new cases made of redmanol EFC. and will then be experimental coils. | ||