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).
Testing an experimental ballast resistance for the 20 HP Battery Ignition system.
| Identifier | ExFiles\Box 168a\5\ img028 | |
| Date | 18th December 1928 | |
| To HY.{Tom Haldenby - Plant Engineer} from EFC. c. EP.{G. Eric Platford - Chief Quality Engineer} Mx.{John H Maddocks - Chief Proving Officer} X7720 EFC5/T18.12.28. 20 H.P. BATTERY IGNITION. X5660 Referring to EP{G. Eric Platford - Chief Quality Engineer}6/H17.12.28. we are now urging from the Expl. Shop the completion of our experimental 1‡ value ballast resistance. Before proposing this for standard it is desirable to make a test of the heating of the present standard coarser primary coil in series with this ballast continuously on voltage overnight. This we intend to do so soon as the ballast is available. EFC. | ||