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).
To Mr Barrington regarding the performance of large taper valve springs.
| Identifier | ExFiles\Box 80\3\ scan0135 | |
| Date | 7th September 1912 | |
| Mr Barrington X290 RE LARGE TAPER VALVE SPRINGS The second set of the above have now run for 10,000 miles without breakages. E.P. File | ||