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).
Condition of battery separators after a vibration test.
| Identifier | ExFiles\Box 63\4\ scan0059 | |
| Date | 22th June 1933 | |
| The separators were in perfect condition no signs of wear due to vibration This battery will be fitted for further tests. HB{C. E. Harcombe} 22-6-33 | ||