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).
Gas-tightness of 4-pinned rings on 20 HP pistons.
| Identifier | ExFiles\Box 105\2\ scan0188 | |
| Date | 19th September 1928 | |
| 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} X5040 R4/19.9.28. 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} | ||