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).
Experiments on ballast resistances to reduce internal ignition coil heating.
| Identifier | ExFiles\Box 168a\5\ img036 | |
| Date | 16th January 1929 | |
| EP.{G. Eric Platford - Chief Quality Engineer} from EFC. X7720 EFC4/T16.1.29. BALLAST RESISTANCE Re your enquiry, we have experimented on 1 1/2 value ballast resistances in place of standard double value in regard to internal ignition coil heating, and do not find the heating as small as we hoped. With 1 1/2 value the heating would be reasonable. We therefore now send you three 1 1/2 value resistances for trial. If you say these cure the fault complained of, then it will be arranged forthwith to instruct them as standard. EFC. | ||