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).
Hand-drawn sketch of a tube/pipe cross-section with a circled feature, alongside handwritten valve timing notes.
| Identifier | WestWitteringFiles\V\October1930-February1931\ Scan041 | |
| Date | 5th November 1930 guessed | |
| The text is written upside-down on the document. 32 EX Camshaft STARTS TO OPEN @ 20° FULLY OPEN @ 61° STARTS TO CLOSE AT 50° CLOSED AT [illegible] | ||