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).
Experimental and test sheet for a battery, logging usage dates, locations, and mileage.
| Identifier | ExFiles\Box 168b\3\ img210 | |
| Date | 1st July 1929 | |
| X7535P ELECTRICAL EXPERIMENTAL & Test SHEETS. XNa 7535P P4RBDH14-6 Battery (197) F79640 Date on | Location | Date off | REMARKS. | Miles Reading Start. | Miles Reading Finish. | Miles Covered. | Total Miles. --- | --- | --- | --- | --- | --- | --- | --- 3-12-28 | Received Charged | 10-12-28 | Guarantee no. K/51249D | | | | 10-12-28 | 1SEX | 22-5-29 | | 762 | 17987 | 17225 | 17225 22-5-29 | 6MS | 1-7-29 | No further record kept. | | | | | | | AJ | | | | | ||