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).
Note from Mr. Royce regarding a new valve spring design to reduce stress.
| Identifier | ExFiles\Box 80\3\ scan0119 | |
| Date | 27th March 1912 | |
| ef. Mr Royce's Note 6/3/12. Re Valve Springs. TBB11/L27312. Engine Dept. 27.3.12. D.O. Please get out a valve spring having the convolutions of larger diameter at the top. This will reduce the stress on the lower turns. The drawing should bear a note that the spring should be so wound that the convolutions will all close up together when the spring is compressed. The same gauge of wire of course should be used throughout. | ||