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 replacement of a Peto & Radford 40/50 size battery on a School Car.
| Identifier | ExFiles\Box 38\5\ Scan312 | |
| Date | 15th May 1923 | |
| X3398 15.5.23. X.3398 - PETO & RADFORD BATTERY - 40/50 SIZE. P & R battery BDT11/4 (No.105) has now been fitted to School Car in place of P & R BDW11/2 (No.75). E.F.C. EFC. | ||