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 and observations on the condition of dynamo brushes and commutator after testing.
| Identifier | ExFiles\Box 50\5\ Scan343 | |
| Date | 29th June 1920 | |
| RR 238 (150 BKS) (SHST.29-6-20.) MP 224358 ROLLS-ROYCE LTD. INSTRUCTIONS. To ________ 19__ Order No. W.A75 (2) Customer's No. ________ Main positive brush (which in this case would be the main negative) - polished well all over the surface. Main negative (new positive) Fairly well polished all over slightly blackened at trailing edge. control brush - leading edge bright but rest blackened all over. commutator - good - light brown colour. The dynamo connections were then changed over to their normal positions and the dynamo run for a short time intermittently and Signed couted This Sheet must be filed on completion of the work. | ||