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).
Brief report comparing the performance of Lodge C.9 plugs against K.L.G. plugs.
| Identifier | ExFiles\Box 33\3\ Scan043 | |
| Date | 19th January 1920 | |
| BN.{W.O. Bentley / Mr Barrington} from Hs.{Lord Ernest Hives - Chair} c. to Wd.{Mr Wood/Mr Whitehead} C.K. x1812 C. Hs{Lord Ernest Hives - Chair}2/LG19.1.20. X 1812 RE SPARKING PLUGS. At the moment we know of nothing better than the Lodge C.9. plugs. The tests with the K.L.G. plugs have not been carried far enough to say whether they are entirely satisfactory. Hs.{Lord Ernest Hives - Chair} | ||