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).
Agreeing to Mr. Hives' suggestion to add a fifth groove and ring to pistons on post-war cars.
| Identifier | WestWitteringFiles\G\July1921\ Scan33 | |
| Date | 22th July 1921 | |
| To HM.{Capt. W. Hallam - Head Repairs} from R.{Sir Henry Royce} Copy to CJ. " WOR.{Arthur Wormald - General Works Manager} " " HS.{Lord Ernest Hives - Chair} X2748. ORIGINAL R8/G22/7/21. 2. RE POST-WAR CARS FITTED WITH FOUR RINGED PISTONS. With reference to your memo Hm{Capt. W. Hallam - Head Repairs}12/W18/7/21, I agree to Mr. Hives suggestion of turning a fifth groove on the above pistons and fitting an extra ring, if it has been proved to have distinct advantages. R.{Sir Henry Royce} | ||