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).
Performance of 4 pinned rings in 20 HP pistons, despite ending trials on cross web pistons.
| Identifier | ExFiles\Box 103\4\ scan0023 | |
| Date | 19th September 1923 | |
| Hs.{Lord Ernest Hives - Chair} from R.{Sir Henry Royce} c. to BJ. Wor{Arthur Wormald - General Works Manager}: BY.{R.W. Bailey - Chief Engineer} X5050 R4/M19.9.23. 20 HP. ETC. PISTONS. G.4. X.5040 X.5230 X.741 X.5050 Although we have no further interest in the cross web pistons tried on the above car, one should not conclude that 4 pinned rings will not hold gas-tight. We are anxious to hear of new head and exhaust for this. R.{Sir Henry Royce} | ||