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).
Performance and longevity of A.C. and Champion spark plugs.
| Identifier | ExFiles\Box 90\2\ scan0129 | |
| Date | 18th September 1936 | |
| To Hs{Lord Ernest Hives - Chair}/Wst from Sg.{Arthur F. Sidgreaves - MD} Sg{Arthur F. Sidgreaves - MD}4/E18.9.36 - 2 - A.C.plugs to try for some little time and that Champion plugs maybe even longer, but one feels that there is something more about it than plugs - otherwise why do not other people have it? I spoke to Raymond Mays who has driven his car 18,000 miles and asked him if he had had it and he said he had not. Sg.{Arthur F. Sidgreaves - MD} | ||