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).
Instruction sheet detailing the condition and advantages of tungsten points compared to platinum.
| Identifier | ExFiles\Box 35\6\ scan 141 | |
| Date | 29th June 1920 | |
| RR 238 (150 BKS.) (BH57:29-6-20.) MP 224355 ROLLS-ROYCE LTD. INSTRUCTIONS. To Order No. (2) Customer's No. 19 The tungsten points have not been reported troublesome at all throughout the run, their present condition being as follows:- (See WAIII) Screw point Worn down about 50% and pitted the surface being observed to be oxidised. lever point Hardly worn at all, the surface being much the same as the screw point. The only advantage with tungsten appears to be due to the fact that the metal does not flow so readily and form large pips and cavities as with platinum, which means a longer life of the points. Signed H.E.W. This Sheet must be filed on completion of the work. | ||