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 difficulty in working with a piece of tungsten for low tension contacts.
| Identifier | ExFiles\Box 35\5\ scan 085 | |
| Date | 2nd January 1920 | |
| To CK.{Mr Clark} from RHC.{R. H. Coverley - Production Engineer} X.2894. RHC{R. H. Coverley - Production Engineer}1/LG2.1.20. RE TUNGSTEN POINTS - X.2894. With reference to the piece of Tungsten which was obtained from the B.T.H. Company for the purpose of making low tension contacts, this is much too hard for us to work. We are unable to cut it with a tool and it is too brittle to enable us to grind it as the pressure of the stone causes it to break. RHC.{R. H. Coverley - Production Engineer} | ||