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 of battery charging curves with and without filter chokes, taken at 30 M.P.H.
| Identifier | ExFiles\Box 168b\1\ img278 | |
| Date | 3rd June 1940 guessed | |
| CURVES TAKEN WITH SPECIALLY DISCHARGED BATTERY WITH AND WITHOUT FILTER CHOKES AT 30 M.P.H. E CHARGING CURRENT + - | ||