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).
Specification for wire fittings, stating the standard 20/25 ignition coil will be used.
| Identifier | ExFiles\Box 30\2\ Scan110 | |
| Date | 10th November 1932 | |
| - 5 - E.6/HP.10.11.32. ------------ (31) Wire Fittings. - The standard 20/25 ignition coil will be used. E.{Mr Elliott - Chief Engineer} | ||