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).
Page 2 of a document concerning work on three material test pieces.
| Identifier | ExFiles\Box 77\1\ scan0112 | |
| Date | 3rd July 1912 guessed | |
| -2- Works on three test pieces of this material. | ||