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).
Instructions on preventing pit formation at electrical contact points due to sparking.
| Identifier | WestWitteringFiles\L\2Jan1924-March1924\ Scan50 | |
| Date | 29th June 1920 | |
| RR 295 (150 BKS.) (BH57.29-6-20.) MP 224358 ROLLS-ROYCE LTD. INSTRUCTIONS. To 19 Order No. PC.20. (4) Customer's No. is reached at the surfaces apart from that due to sparking at the points. The formation of a pit could probably be eliminated by reversing the current through the points periodically, but the trouble appears in the first place to be due to insufficient contact surface area. Signed C.A.P. This Sheet must be filed on completion of the work. | ||