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).
Request to obtain enamelled secondary wire for winding six experimental ignition coils.
| Identifier | ExFiles\Box 69\1\ scan0253 | |
| Date | 2nd November 1929 | |
| X8710. Roy.{Sir Henry Royce} from EFC. c. Ey. EFC1/AD12.11.29. X.8710. IGNITION COIL SECONDARY WIRE. Would you please obtain a small quantity of No.42 S.W.G. (.0040) enamelled secondary wire, from Messrs. McCleod, Holborn, say sufficient for the winding of six ignition coils. It is understood from Messrs. North's that the wire from these suppliers has been found as good as any for uniformity of diameter and we wish to try same on experimental coils. EFC. | ||