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).
Graph showing the normal curve for a battery charge at 5.1 Amperes.
| Identifier | ExFiles\Box 164\3\ img037 | |
| Date | 2nd July 1937 | |
| D LABORATORY. DATE 2-7-37 BATTERY CHARGE AT 5.1 AMPERES NORMAL CURVE CHARGE 8 9 10 11 CURVE No. C.A. Evans. | ||