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 from supplier Le Carbone clarifying the grading system of supplied brushes.
| Identifier | ExFiles\Box 50\5\ Scan021 | |
| Date | 8th February 1922 | |
| X 3945 4333 COPY OF LETTER RECEIVED FROM:- LE CARBONE, COVENTRY HOUSE, SOUTH PLACE, LONDON, E.C.2. 8.2.22. Messrs. Rolls-Royce Ltd., Nightingale Road, Derby. Dear Sirs, X.3945. Your ref. Wd{Mr Wood/Mr Whitehead}/Dn3/HP7222. X14383. Our ref. 6555/P.7331 We thank you very much for your favour of yesterday with reference to the brushes supplied to the order referred to, and have pleasure in confirming that brushes supplied by us marked "Z" are identical with that you term our grade "O". At one time our "Z" grade brushes were simply marked © but we later also adopted the use of the letter "Z" as an additional means of identification, and frequently this letter alone serves to designate the grade. Whenever you specify our "O" quality, we know you mean our "Z" grade, and we supply this material. We trust this makes matters clear, and are, Yours faithfully, FOR LE CARBONE. R/P | ||