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).
Analysis and comparison of battery cell components, specifically separators.
| Identifier | ExFiles\Box 54\5\ Scan129 | |
| Date | 18th December 1929 guessed | |
| T.D.46. #4 ST Battery cell no1 P&R Std. The positive plates were good & much stronger than the cell out of SS{S. Smith} battery which was fitted with Threaded Rubber Separators & had also lost a less amount of active material. The peripheries of some of the plates were fractured. The negative plates were good, the paste was quite firm & solid compared with the negatives in the other cells. The wood & ebonite separators were in a perfect condition throughout. The wood had a green tint appearance on the side which faced the negative plates. Failure was due to treeing across the edges of the plates & separators. I think we can now say definitely that the Threaded Rubber Separators are inferior to our Std combined wood & ebonite separators. The Threaded Rubber becomes very brittle & is very easily fractured (on test). | ||