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 mileage recorded by Ferranti and Park Royal ammeters on various car chassis.
| Identifier | ExFiles\Box 168\5\ img183 | |
| Date | 2nd June 1930 | |
| X3498 2.6.30. X.4670. X.3498. AMMETER MILEAGES ON CARS. These ammeters have now ran the miles as stated on various chassis. Ferranti ammeters. Instr. No. Chassis or Lab. Miles ran. - 14-GIV 30,186 32352 12-GIV 6,337 32353 14-EX 2,295 32354 17-GIV. 3,379 32355 Lab. 0 32356 . 0 Park Royal ammeters. 58961 Lab. 91 58962 18-EX 11,436 58963 19-EX 3,432 58964 22-EX 2,579 58965 Lab. 197 58966 23-EX 10,506 GJ. | ||