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).
Material testing and a suggestion for using a steel ball with white metal lining to avoid casting defects.
| Identifier | ExFiles\Box 77\1\ scan0110 | |
| Date | 24th June 1912 guessed | |
| (2) this I am having some test bars made and sending them for testing to Sheffield. I think a softer material would stand shocks better. The best job would however, be undoubtedly a steel ball with white metal lining as this would alleviate any defects due to casting. (sgd) R.W.H.B. | ||