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).
Instruction memo to produce a modified exhaust system front expansion box with a smaller diameter.
| Identifier | ExFiles\Box 104\2\ scan0086 | |
| Date | 13th July 1934 | |
| To RHC.{R. H. Coverley - Production Engineer} +523D Hs{Lord Ernest Hives - Chair}/Wym.{G. Harold Whyman - Experimental Manager}8/KW.13.7.34. 20-G-IV. Will you please instruct for an exhaust system front expansion box to be made up .500" smaller than present standard, i.e., 4.250" shell dia. instead of 4.750", same to be fitted to above car. Hs{Lord Ernest Hives - Chair}/Wym.{G. Harold Whyman - Experimental Manager} | ||