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).
Query to confirm if grade 'Z' Le Carbone brushes are identical to the recommended grade 'O' for the Goshawk dynamo.
| Identifier | ExFiles\Box 50\5\ Scan018 | |
| Date | 6th February 1922 | |
| Wd{Mr Wood/Mr Whitehead}/Ms. from EFC. X.4333 EFC3/T6.2.22. 4333 X.3945 - LE CARBONE BRUSHES FOR GOSHAWK DYNAMO. Would you kindly confirm that the brushes which we have recently received from The Le Carbone Company, marked "Z", are really identical with their grade "O", which has been recommended to us by Messrs. Royce Ltd. for use on the dynamos. EFC. | ||