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 order of batteries for the Experimental Department cars.
| Identifier | ExFiles\Box 168b\3\ img189 | |
| Date | 13th March 1929 | |
| Roy.{Sir Henry Royce} from WFC. X75317 P WFC3/T13.3.29. BATTERIES. Please order for Expl. Dept. Cars one standard 20 H.P. Exide battery and one new standard two-unit S.S. Peto & Radford battery, both to be delivered fully charged. The 20 H.P. battery is rather urgently required. O/N.54733 WFC. | ||