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).
Instruction detailing modifications to the Air Valve Cover, including machining and polishing.
| Identifier | ExFiles\Box 35\3\ scan 026 | |
| Date | 18th July 1921 | |
| X.2764 Extract from BY5/P18.7.21. X.3545. 3. Air Valve Cover. Instructions were sent out some time ago to machine the above part parallel on both faces. A note to this effect was added to E.17444, and a copy sent to Springfield. Recently a modification has been made to this piece in regard to the manner of holding the spring. This was incorporated in drawing E.20021. In this instance again the cover is shown machined as well as polished. BY.{R.W. Bailey - Chief Engineer} | ||