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).
Improved condition of copper contacts after a test on a switch.
| Identifier | ExFiles\Box 64\4\ scan0323 | |
| Date | 16th December 1930 guessed | |
| (2) could Copper contacts confirmed this as upon examination at the conclusion of the test it was noticed that very little burning or marking had occurred being much less than that experienced with a similar test we carried out on a standard switch. With the thicker gauge copper laminated contact brush which we have asked for and which is fitted to the switch on 27EX, therefore, the contact condition should be still further improved. HEwest | ||