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).
Procedure for substituting Lodge plugs for Mercury plugs on 40/50 models due to a supply shortage.
| Identifier | ExFiles\Box 50\2\ Scan074 | |
| Date | 20th July 1922 | |
| SFF. [crossed out] from BY.{R.W. Bailey - Chief Engineer} c.c. Mr Scott. [crossed out] c.c. RF. [crossed out] c.c. Hs.{Lord Ernest Hives - Chair} c.c. Plat. [crossed out] X4295 U. 1 BY2-P20.7.22. X4295 / X4425 [crossed out] 40/50 PLUGS. In view of the fact that we have run out of Mercury plugs and are absolutely unable to obtain them at the moment, the following procedure should be adopted;- (a) as spares. No more Mercury plugs should be sent away Six Lodge plugs should be used for this purpose. (b) We should continue to use six Lodge and six Mercury on the engine whilst Mercury plugs hold out. When these fail we must fit all Lodge. DICKINSON BOND BY.{R.W. Bailey - Chief Engineer} | ||