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).
Extract from a 10,000-mile report on chassis 18-GIV regarding the coil's performance.
| Identifier | ExFiles\Box 164\5\ img036 | |
| Date | 30th January 1931 | |
| X6058 Extract from report on 18-GIV at 10,000 miles dated 30.1.31 X.6058. COIL TO LOP. D.72503. The coil was giving its maximum spark at the finish of the mileage. There is no indication that the coil is faulty. | ||