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).
The condition of a pair of Tungsten contacts after 1500 miles of use.
| Identifier | ExFiles\Box 35\6\ scan 044 | |
| Date | 24th May 1921 | |
| EFC. EP{G. Eric Platford - Chief Quality Engineer}/Mx.{John H Maddocks - Chief Proving Officer}11/F24.5.21. X 2894 AT X. 2894 TUNGSTEN CONTACTS. We send you herewith the remaining pair of Tungsten contacts, marked "2". These have run approximately 1500 miles, and although you will see the points are pitted, we have not experienced any trouble with misfiring. [STAMP: RECEIVED] EP{G. Eric Platford - Chief Quality Engineer}/Mx.{John H Maddocks - Chief Proving Officer} T | ||