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).
Note regarding electrolyte density and charging procedures, concluding that no new material is required.
| Identifier | ExFiles\Box 46\3\ Scan171 | |
| Date | 11th July 1923 | |
| Contd. EFC2/T11.7.23. with electrolyte of 1320 density, until the required increase is secured after which again pass charging current for a short while. Apparently it will not be necessary to send any new material. EFC. | ||