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 performance and leaking issues of Mercury plugs and the suitability of yellow brass plugs.
| Identifier | ExFiles\Box 50\2\ Scan048 | |
| Date | 1st April 1921 | |
| X.4795 Extract from R16/G1.4.21. ----------The Mercury plugs fitted seem so far to give excellent running, but shew signs of leaking past the packing. This matter will be mentioned in another memo, as I think the yellow brass plugs used are not the correct material for the purpose. R.{Sir Henry Royce} | ||