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).
Electrical test observing the oxidation of tungsten points.
| Identifier | ExFiles\Box 35\5\ scan 140 | |
| Date | 15th August 1920 | |
| RR 300 (120B) (SF 349 24-1-19) MP 200552 X.2894 88214 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To: E.F.C. Order No: Customer's No. Re: X 2894 Oxidation of Tungsten Points. The tungsten rods mentioned in the previous report 12-8-20, have been subjected to further sparking at the faced ends, by connecting them through a Lucas dynamo field winding, for an inductance, to a 12 volt battery and continually making and breaking contact for about 4 hours. The positive rod blackened uniformly over the contact area & the negative turned brown, with (Cont'd) Signed This Sheet must be filed on completion of the work. | ||