Instructions for ageing aluminium brake drums before removing the liners.
| Identifier | ExFiles\Box 83\2\ scan0046 | |
| Date | 21th May 1937 | |
| To HPS. {Horace Percy Smith - Experimental Factory Mgr} from Rm {William Robotham - Chief Engineer} /AFM. {Anthony F. Martindale} 200a Rm {William Robotham - Chief Engineer} /AFM. {Anthony F. Martindale} 4/AP.21.5.37 6.B.1V. ALUMINIUM BRAKE DRUMS. With reference to the instructions for 6.B.1V. Before removing the liners from the rear brake drums will you please soak the drums at 190°C. for 20 hours, to ensure that they are completely 'aged'. This treatment does not distort them. Rm {William Robotham - Chief Engineer} /AFM. {Anthony F. Martindale} | ||
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).