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).
Analysis of point wear, suggesting larger points and investigating oxide formation due to high current density.
| Identifier | WestWitteringFiles\L\2Jan1924-March1924\ Scan49 | |
| Date | 29th June 1920 | |
| RR 238 (150 BKS.) (BH57.29-6-20.) MP 224358 ROLLS-ROYCE LTD. INSTRUCTIONS. 19 To Order No. PC 20 (3) Customer's No. of the surface being still fairly bright. The worn surface is slightly blackened and uneven. Generally, the wear on these points is heavy considering the short distance run. From a consideration of the above points and also of the H.P. set (see rept. PC19) the following is suggested. 1. Performance appears to improve with the amount of surface in contact. Larger diameter points may be an improvement. 2. Points appear unable to cope with the current after running for a time. This may be due to the blue black oxide which forms, and which in turn may be due to too high a current density. 3. The usual pit and cavity, which from observations made on the bench, together with the oxide, appear to form without any great amount of sparking taking place, suggest that a high temperature Signed cont'd.{John DeLooze - Company Secretary} This Sheet must be filed on completion of the work. | ||