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).
Case of a valve spring breaking during a Unit Test.
| Identifier | ExFiles\Box 17\6\ Scan049 | |
| Date | 9th July 1928 | |
| X7060 Bys c Hs{Lord Ernest Hives - Chair} Mx{John H Maddocks - Chief Proving Officer}/McM12/T9.7.28. re Valve Springs F.2.B. Further to our Mx{John H Maddocks - Chief Proving Officer}/McM3/T28.6.28, we have another case of a valve spring breaking during Unit Test - at 2750 r.p.m. We are sending the broken spring to By with this memo. Mx{John H Maddocks - Chief Proving Officer}/McM | ||