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).
Comparing the insulation characteristics of yellow and brown 'abakelite' for dynamo brushes.
| Identifier | ExFiles\Box 39\3\ Scan259 | |
| Date | 16th July 1926 | |
| X 3513 To BY/RD. from EFC. EFC/T16.7.26. With reference to your query regarding the comparative insulation characteristics of the continental abakelite for dyna-mo brush insulation of the yellow and of the brown types respectively, we have made comparative tests of these materials and find that the brown material is decidedly inferior in insulation characteristics at temperature, as compared with the yellow. We feel that it would be wiser to retain the use of the yellow material, and will be glad if you will instruct accordingly. EFC. | ||