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).
Log sheet tracking the usage and failure of a P&R+Exide Sandwich Battery.
| Identifier | ExFiles\Box 54\1\ Scan345 | |
| Date | 18th September 1929 | |
| 3. ELECTRICAL TROUBLE SHEETS XMO 46175 P&R+Exide Sandwich Battery S3 (156) Date on. | Location. | Date off. | REMARKS. | Miles reading start. | Miles reading finish. | Miles covered | Total miles. 25.2.29 | 10EX | 12-8-29 | | 10592 | 19151 | 8559 | 45,483 12-8-29 | " | 6-9-29 | | 19151 | 20229 | 1078 | 46,561 No 3 cell (P&R) failed Report ID2) 18-9-29 Remaining cells used as Spares EJ | ||