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 failure analysis of an Exide cell from an SS Battery.
| Identifier | ExFiles\Box 54\5\ Scan121 | |
| Date | 19th July 1929 | |
| C.7.C. X3839. J.D.17. Re Failure of Exide Cell in SS{S. Smith} Battery No 3 cell (an Exide E/H) has now failed in this battery, this failure was predicted to happen shortly in JD{J. Draper - Frames}15 - 15-7-29. When opened up the negative plates were found to be good. The positive plates had the apices of the grid bars facing inwards & had lost less active material than std: plates would have done, but were very weak mechanically. The wood & Ebonite (slotted) separators were poor the plates being badly buckled had pinched & pierced them causing a partial short, which gave the cell a poor capacity & also explains why the density would not come up fully on charge. The actual failure occurred by the one positive plate stretching & shorting on the negative box. G.J. | ||