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 Wellworthy Piston Rings Ltd. concerning a change in material for Aluminium-tin bushes from AC.6 to AC.9.
| Identifier | ExFiles\Box 115\5\ scan0042 | |
| Date | 2nd June 1938 | |
| BUY 272 Agents Copy A.R. FB/EHP. 2nd June, 1938. The Bristol Aero Co, Ltd., Filton House, Bristol. Dear Sirs, Attention of Mr. Ninnes. With further reference to the Aluminium-tin bushes, we have to inform you that there has been a change made in material, it now being established definitely by the Technical Department of Rolls Royce and High Duty Alloys that AC.9 material is now to supersede AC.6., owing to the fear of segregation in casting of the AC.6. material, which now means the elimination of the Antimony content. This facilitates casting, and assures a sound and uniform job, and from a bearing point of view is a very definite improvement on the AC.6. We trust therefore, to keep our mutual records in order, you will send us an order for two bearings in AC.9 material, in cancellation of the previous order for two in AC.6. material, these to be on a free of charge basis as agreed. Yours faithfully, For WELLWORTHY PISTON RINGS LTD., Technical Manager. | ||