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).
The condition of Exide batteries after testing, comparing them to P & R batteries.
| Identifier | ExFiles\Box 54\2\ Scan087 | |
| Date | 17th March 1926 guessed | |
| JC.15. -4- Contd. Exide. The positive plates had lost a large amount of paste in some cases leaving a bare grid, but the grids remained quite strong, especially in the peripheries. The negative plates had lost very little or no paste this having swelled to a considerable extent and was quite soft and spongy. The wood and ebonite separators were very bad the ebonite having chafed away leaving just a framework. The wood had been punctured bery badly due to the negative plates welling and the paste pinching through the wood A large amount of sediment was found which reached up to the plates. Taking time and mileage into consideration the batteries have given about an equal performance, but the P & R is better in respect of the ebonite separators and the positive plates retaining the paste better. This may be accounted for by the Exide cells being loose and therefore subject to more vibration. Attached is a graphical chart showing at a glance the life of the batteries. The horizontal lines represent months. The green vertical strips are the months on bench life tests and the red, months on chassis, with the miles indicated thereon. The blank spaces are time spent standing in laboratory. EFC {E. Fowler Clarke - Electrical Engineer} /G.Johnson. | ||