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).
Comparison of different manufacturers of enamelled copper wire for ignition coil secondary windings.
| Identifier | ExFiles\Box 69\2\ scan0020 | |
| Date | 22th September 1930 | |
| X8712 O.C. c. EFC. c. BM/HD.{Mr Hayward/Mr Huddy} BY9/G.22.9.30. ENAMELLED COPPER WIRE FOR SECONDARY WINDING OF THE IGNITION COIL. ------------------------------------------------------- From a number of experiments carried out by EFC. covering corrodibility, insulating qualities and tendency of enamel to crack, he places the quality of the materials as :- 1/- McLeod (Swiss). 2/- Dudlo (U.S.A.). 3/- Connolly (British). Concordia and Prescot are definitely bad, and should not under any circumstances be used. BY.{R.W. Bailey - Chief Engineer} BM | ||