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).
Analysis of wear and deposits on distributor components made from various metals.
| Identifier | WestWitteringFiles\F\January1921\ Scan54 | |
| Date | 28th January 1921 guessed | |
| Contd. -2- slightly dull. The rotor has pitted at the leading edge and was covered with a dark deposit, but which can be easily rubbed off. The copper mounting has also turn dull. Nichrome. The points are blackened at the centre but have not appreciably brunt away. The remaining surface is unaffected. The rotor (of thinner material than the standard) has burnt away considerably at he sparking edge. Otherwise unaltered. Nickel-Brass. The points are pitted and blackened, but not appreciably burnt away. The rotor is also badly pitted and blackened at the leading edge and is slightly dull all over. The copper clamp remains fairly bright. Nickel. The points are blacken around the centre, but not burnt. The rotor is much blackened and slightly burnt away. The copper block is also slightly dull. Altogether the tungsten (which was made up from wire) seems to have been least affected in the standard distributor, but it would be interesting to see the behaviour of stainless steel points and rotor in a well ventilated distributor. The use of the special metals in the distributor had no appreciable effect on the main sparks at the gaps. It may be considered that a selection of two Contd. | ||