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).
The production of the 'Goshawk' 11 Coil for battery ignition, detailing wire specifications and winding instructions.
| Identifier | ExFiles\Box 45\4\ Scan007 | |
| Date | 2nd February 1922 | |
| H.R. 235c (10 T) (S.J 194.9.6.21). x2079a RECEIVED 8 FEB 1922 EFC BY/WER11/EF9. 2. 22. "GOSHAWK" 11. COIL FOR BATTERY IGNITION SECTION 8140. We have released the above unit for production less the following parts:- Primary Winding ( for our latest instructions to the Experimental Dept., see BY/WER2/EF16.1.22) Secondary " (for our latest instructions to the Experimental Dept., see BY/WER5/EF27. 1.22) Regarding the secondary winding we propose using all the 43 S.W.G. enamel coated covered wired that is in stock, after that any future orders will of course be to the standard wire i.e.,44 S.W.G. We hope to shortly hear from you that the coils wound with the above windings are O.K. so that we may release the wire for production purposes. BY/WER. W.R. | ||