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).
Defects and sparking observed in tungsten points from the Independent Lamp and Wire Co.
| Identifier | WestWitteringFiles\F\January1921\ Scan34 | |
| Date | 24th January 1921 guessed | |
| -2- Contd. A pair of tungsten points by the Independent Lamp and Wire Co., which have been run on a car, showed the same defects to a greater degree. These were of smaller diameter then the Liberty points. A fair amount of sparking has occurred at the contacts throughout the above test. Contacts herewith. F.J.A. COPY | ||