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).
Note regarding compression, engine speeds, and carburetter restriction.
| Identifier | Morton\M2.1\ img046 | |
| Date | 1st April 1928 | |
| -3- 17 Hs{Lord Ernest Hives - Chair}1/LG3.4.28. compression, higher engine speeds and less restriction on the carburetter. (Sgd.) Hs.{Lord Ernest Hives - Chair} | ||