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 concerning the 'Granoseal' process for treating Merlin piston rings and the tin-coating of pistons.
| Identifier | ExFiles\Box 148\3\ scan0311 | |
| Date | 7th March 1938 | |
| TELEPHONE: VICTORIA 0671 (5 LINES). CODES: A.B.C. 5TH EDITION. ALL COMMUNICATIONS TO BE ADDRESSED TO THE COMPANY. ON ADMIRALTY, WAR OFFICE AND AIR MINISTRY LISTS. THE LIGHT PRODUCTION CO. LTD PROPRIETORS OF THE LONDON PISTON RING CO. LIMITED. ENGINEERS TELEGRAMS: INLAND, NAPOLEONIC, SOWEST, LONDON. FOREIGN, NAPOLEONIC, LONDON. 60/66, ROCHESTER ROW, WESTMINSTER, S.W.1 WORKS AND GOODS ADDRESS: 61/67, GREENCOAT PLACE, WESTMINSTER, S.W.1. OUR REF. CHB/IR YOUR REF. 7th March 1938. W.A.Robotham Esq., Experimental Dept., Messrs. Rolls Royce Ltd., DERBY. Dear Robotham, Whilst visiting your people last Tuesday in connection with Piston Rings for the Merlin, Mr.Clough made some reference to the Granoseal process of treating piston rings and expressed a wish to see one. As you mentioned this matter to me some time ago, this letter is just to advise you that I have sent him an example and asked him to let you see it as well. Personally, I do not consider the process to be of much material value unless it can be made both harder and more adhesive, and in any case, it would seem that when the surface is removed, as the originators intend, the increase in gap will be considerable. In connection with the Merlin Pistons which Mr.Matthews has sent us for tin-coating, I am pleased to hear that results of the pistons we have already treated are promising. The process has proved most valuable this winter, under certain conditions of engine manufacture with which we have to contend, and there is also one additional feature, which I think would appeal very strongly to you people, and that is that the process functions as a most | ||