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).
Follow-up letter discussing dynamo modifications and material issues, recommending a switch from bakelite to a micanite ring for the commutator.
| Identifier | ExFiles\Box 50\5\ Scan057 | |
| Date | 19th May 1922 guessed | |
| (2) the cheaper American scheme (with either of the above ested modifications) which are thoroughly reliable. I think if you adopt this last suggestion, and will fit the dynamo with the Le Carbon brushes originally specified, we should have no more trouble, and the dynamo should give complete satisfaction. R.{Sir Henry Royce} Since writing the above, I have seen a further sample of burst commutator: quite certain it is the heat which has shrunk and weakened the bakelite, suggesting it is an unsuitable material or we are using the wrong variety. This confirms the conclusion arrived at in this letter, to go back to micanite ring, a design for which we send today. R.{Sir Henry Royce} | ||