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).
Extract report on the performance of P & R celluloid and ebonite batteries.
| Identifier | ExFiles\Box 38\5\ Scan050 | |
| Date | 2nd May 1919 | |
| X.3398 Extract from EFCl/T2.5.19. Se P & R 60 AMPERE HOUR CELLULOID AND 45 AMPERE HOUR EBONITE These batteries are quite fair as regards internal resistance, but they have not "shown up well in discharge capacity. The construction of the batteries appears quite good and the arrangement of cells is such as we require. | ||