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 6 'Spectre' Ignition Coils, detailing specific materials to be ordered for the primary winding.
| Identifier | ExFiles\Box 164\5\ img200 | |
| Date | 20th February 1934 | |
| RHC.{R. H. Coverley - Production Engineer} [Strikethrough] c - Hs{Lord Ernest Hives - Chair}/Wst. WST 86017 BY/RD5/W.20.2.34. "SPECTRECodename for Phantom III". IGNITION COIL,SEC.8140. Will you please put in hand 6 Ignition Coils in accordance with L.O.P. D.74200,also :- D.74198 - Section of Windings. D.74199 - Piece Number Tab. The whole of this material consists of standard material with the exception of the primary winding, for which we should order :- 4 lbs. of 21 SWG. .032" dia. D.S.C. Copper Wire. BY/RD. | ||