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).
Adding a charging switch to the ignition system to control battery charging during testing.
| Identifier | ExFiles\Box 65\2\ scan0133 | |
| Date | 21th September 1928 guessed | |
| Contd. -2- Alternatively it might be considered desirable to add charging switch contacts to the first or B position so that charge would only be definitely off in the off position of that (ignition) switch. In that case, the condition referred to by yourself, viz. of "running either or both ignitions with or without charge" would be completely satisfied. One justification of having the battery off charge when testing the battery ignition is perhaps that the battery may be considered a part of the battery ignition which is on test. It could be stated in the Instruction Book that the system was automatically arranged to give no charge in any case (i.e. whether charging switch be on or off) when testing the battery ignition. Using an ordinary miniature tumbler switch as a field breaking switch frequently used to cut off the charge, we are satisfied that the field break flash does a negligible amount of harm to the contacts of such a switch. EFC. | ||