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).
The properties, casting difficulties, and potential uses of Mr. Hall's light alloy.
| Identifier | ExFiles\Box 14\3\ Scan016 | |
| Date | 20th August 1928 | |
| BY.{R.W. Bailey - Chief Engineer} H1. from R.{Sir Henry Royce} Hs.{Lord Ernest Hives - Chair} c. to BJ. Wor.{Arthur Wormald - General Works Manager} +7050 R8/M20.8.28. RE. MR. HALL'S LIGHT ALLOY. X.7050 X.3801 I understand that this is satisfactory as regards specific gravity and strength even to fairly high temperatures, but is still shewing difficulty of casting, and has not behaved well underhigh temperature conditions. I am not sure whether the trouble with cyl. heads is due to original porosity in the casting, or whether it is due to changes occurring in the alloy due to it being exposed to the explosive gases or high temperature. It is understood however that in any case it will still be extremely useful for saving weight on parts not exposed to temperature, and it also forges well. Its characteristics in the forged state may be different. R.{Sir Henry Royce} | ||