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).
Requesting a comparison between insulating paper waxed before winding versus paper waxed after being wound into an ignition coil.
| Identifier | ExFiles\Box 69\2\ scan0021 | |
| Date | 24th September 1930 | |
| X8712. EFC. By/RD2/W24.9.30. X1109 X8712 RE :- IGNITION COIL INSULATING PAPER. We send you herewith samples of waxed paper which we normally use in our Ignition Coils, and also samples of a plain paper which has been wound into a standard coil and impregnated with wax. You will see that the wax has thoroughly saturated the paper and upon examination, even to the innermost layers the wax was thoroughly in. Would you please say if this second paper is equal to that which is waxed before winding. By/RD. | ||