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).
Letter to Messrs. Le Carbone regarding testing different grades of control brushes for a small dynamo.
| Identifier | ExFiles\Box 50\5\ Scan147 | |
| Date | 22th December 1922 | |
| X 4333. EFC {E. Fowler Clarke - Electrical Engineer} 2/T. 22nd. December, 1922. Messrs. Le Carbone, Coventry House, South Place, London, E.C.2. Dear Sirs, Answering yours of the 21st inst. with reference to control brushes for our small dynamo, it will be quite sufficient for the purposes of test to have four in each of the two grades you mention, namely, EG.30 and EG.60. As you remark the EG.30 quality brushes forwarded to us in August last were all for the main circuit. As explained to your representative, we are at present quite well satisfied with the 'Z' grade, but we shall certainly be interested sometime to make the experiment of using these E.G.30 and the EG.60 for the control brush. Yours faithfully, FOR ROLLS-ROYCE LIMITED. | ||