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).
Variability of Edison cells compared to lead cells, like Exides.
| Identifier | ExFiles\Box 1\7\ B001_X15 20 46 50 59-page217 | |
| Date | 19th March 1913 | |
| X.50. 19.3.13. Mr. Wormald. R4/B14.6.13. X.50. 2nd. Query. ---------- Edison cells certainly do vary a great deal more than the lead cells, especially when compared with the Exides. I have herewith sent the charging and discharging book of different makes. W Ellis. | ||