Conclusion of tests recommending the standardization of Champion and Mercury spark plugs for U.S.A. and English made cars respectively.
| Identifier | ExFiles\Box 49\5\ Scan090 | |
| Date | 16th February 1921 | |
| Contd. -2- R1/G16.2.21. satisfactory. In conclusion, I agree (subject to further exhaustive tests confirming) to prepare for at once standardizing the Champion (Canadian make) for U.S.A. and the Mercury (Birmingham make) for English made cars. R. {Sir Henry Royce} | ||
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).