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 the Experimental Department for three ignition ballast resistances using a specific length and gauge of nickel wire.
| Identifier | ExFiles\Box 168a\5\ img034 | |
| Date | 16th January 1929 | |
| X7720 To Mr. Brock/Mr.Wolstenholme. EFC3/T16.1.29. BALLAST RESISTANCE Please supply Expl. Dept. (O/N.54733) with three ignition ballast resistances, but with 35" of No. 32 S.W.G. nickel wire in place of the standard length and gauge of wire. Stock 32 S.W.G. wire is handed you herewith. EFC. | ||