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 Brinell hardness test of a Duralumin Push Rod.
| Identifier | ExFiles\Box 76\3\ scan0131 | |
| Date | 19th January 1927 | |
| Hs.{Lord Ernest Hives - Chair} 4771 H15/EA18.1.27. Laboratory R124. Re Duralumin Push Rod submitted for hardness Test. The approximate Brinell hardness figure obtained on the above is 111. Hs{Lord Ernest Hives - Chair} Hl. He. RECEIVED JAN 19 1927 | ||