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).
Failure of a Vickers valve spring during testing on a test rig.
| Identifier | ExFiles\Box 80\3\ scan0216 | |
| Date | 29th August 1912 | |
| X375 Valve Springs (Re B.C.T. Valve Spring C916 - Vickers.) Mr Nadin 29.8.12. TBB7/L29812. I send you herewith another of the above valve springs (No.6 inlet) which has broken after 60 hours running on the test rig. This represents 3600 miles. These springs do not appear to be any good and they will be removed from the test rig as soon as another set of the taper springs can be fitted. | ||