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).
Conclusion on the lack of advantage of using paraffin wax-filled coils over standard ones.
| Identifier | ExFiles\Box 69\1\ scan0156 | |
| Date | 3rd October 1928 guessed | |
| -2- We do not consider there is much advantage over standard with coils filled with paraffin wax. EPC/H.E.West. | ||