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).
Laboratory report on the ultimate stress of various aluminium alloys after heat soaking.
| Identifier | ExFiles\Box 86\2\ scan0023 | |
| Date | 28th March 1933 | |
| X236 To Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} HL2/AG.28.3.33. Laboratory. Report No.L2657. RE - ALUMINIUM ALLOYS. (See Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}10/KT.27.3.33.) Zinc Copper Alloy. (Struck through, with handwritten annotation 'aluminium' above) 8% Copper. R.R.53 unheat-treated. Ultimate Stress at 300°C after soaking for 30 mins. 3.5 tons. 7.5 tons. 13.5 tons. Hl. HC | ||