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 discussing the adoption of 'Mercury' plugs, their price, and repairability.
| Identifier | ExFiles\Box 50\2\ Scan038 | |
| Date | 21th February 1921 | |
| X4295 Extract from RS{Sir Henry Royce's Secretary}/G21.2.21.(X;634) X4295 MERCURY PLUGS. ------ I am very keen on the adoption of the new plugs mentioned above "Mercury" is the trade name manufactured in Birmingham. Price about 1/3 each, can be cleaned and repaired by any intelligent person. R.{Sir Henry Royce} R.R. Y358. (100 T) (S.H. 798. 10-12-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2948 | ||