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).
Urging the production of a special ignition coil with a tapped secondary winding for voltage measurement.
| Identifier | ExFiles\Box 69\1\ scan0319 | |
| Date | 7th March 1930 | |
| To RHC.{R. H. Coverley - Production Engineer} from EFC. X.8710 EFC4/MS1 7.3.30. X.8710 Ignition Coil with tapped secondary winding for voltage measurement. May we please urge with you the production of this special coil instructed by our EFC2/AD.11.2.30. EFC. | ||