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).
Particulars of Ballast Resistance for a Goshawk Ignition system, as given on drawing D.50197.
| Identifier | ExFiles\Box 54\5\ Scan203 | |
| Date | 11th September 1922 | |
| X3485 X.3485. GOSHAWK IGNITION. Particulars of Ballast Resistance as given on Drawing D.50197 :- The wire is of nickel No.31 S.W.G. (.0016" dia.) Total length of wire - 32" Dia. of coil .265. EFC. {E. Fowler Clarke - Electrical Engineer} | ||