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).
The trial and potential adoption of Perfect Circle piston rings.
| Identifier | ExFiles\Box 16\1\ Scan198 | |
| Date | 7th November 1927 | |
| Na{Mr Nadin}, Springfield. from HsF V741 Hs{Lord Ernest Hives - Chair}3/LG7.11.27. PERFECT CIRCLE PISTON RINGS. X.741 At the moment we have not standardised these rings for standard production. We are trying them out on some new pistons. It is our intention to adopt these rings on any new pistons we may produce. Hs.{Lord Ernest Hives - Chair} | ||