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).
Test report on the failure of Tungsten Points in a Watford Magneto due to arcing.
| Identifier | ExFiles\Box 35\6\ scan 012 | |
| Date | 24th January 1921 | |
| RR 300 (120B) (SF 349 24-1-19) MP 200552 X.2894 91279 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To E.F.C. Order No. P.A. 59. Customer's No. Re X 2894. Test of Tungsten Points on X 2375 Watford Magneto Eb. No 110886 The contact points were set to give a break of .020". Regular sparking could not be obtained at 1500 revs on account of what appeared to be quite a stable arc set up between the the contact points. As the speed was lowered, this arcing was slightly reduced, and the sparking improved. A smaller gap on the breaker was then tried, which also partly reduced the arcing, but it was evident that the points were a failure. Signed C.A.P. This Sheet must be filed on completion of the work. | ||