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).
Page from a document discussing the function of a green indicator lamp and its effect on battery charge.
| Identifier | WestWitteringFiles\T\2January1929-June1929\ Scan229 | |
| Date | 15th May 1929 guessed | |
| -3- Contd. On the other hand, if the indications of the green lamp are taken as an injunction to the driver to switch off charge whenever it lights, then due to the fact that the charge does not itself become switched on again, loss of battery charge must inevitably result. EFC; | ||