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).
Secret memo regarding the design and testing of a double ring piston.
| Identifier | WestWitteringFiles\M\April1925-June1925\ Scan12 | |
| Date | 4th April 1925 | |
| ORIGINAL FROM E.{Mr Elliott - Chief Engineer} SECRET. E1/M4.4.25. Copy to - C.J. HS.{Lord Ernest Hives - Chair} DF. E.{Mr Elliott - Chief Engineer} A.{Mr Adams} C. re. DOUBLE RING PISTON. X8040 Regarding the above we have already given verbal instructions and dimensions when in Derby for some of these pistons to be made, and it is possible that they are on test now. We have since made a drawing as per attached blue print of LeC. 2045. shewing the piston. The lower rings are the existing type used on production. The upper ones are to give half the pressure. E.{Mr Elliott - Chief Engineer} | ||