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).
Results of a 10,000-mile bench test on large diameter tungsten contact points.
| Identifier | ExFiles\Box 35\6\ scan 157 | |
| Date | 28th October 1925 | |
| RR 239 (150 BKS.) (SH57. 20-6-20.) MP 224359 X.2894. ROLLS-ROYCE LTD. INSTRUCTIONS. To E.F.B. Order No. WB{Mr Brazier/Mr Bell} 54 Customer's No. X 2894 Date 28-10-1925 Large Diameter Tungsten contact points (10000 mile Bench test under standard conditions) The above test has now been completed and the contact points in question are handed to you herewith for inspection. It will be observed that there is an absence of pitting on the surface of the points, the only irregularity of the surface being the pip and cavity formed by the flow of the metal. This pip is smaller than that usually obtained with standard points. The wear in the depth of the points has been practically nil. Signed contd This Sheet must be filed on completion of the work. | ||