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 tyre noise on the 20/25 HP model.
| Identifier | ExFiles\Box 157\1\ scan0254 | |
| Date | 3rd December 1935 | |
| W/S - Cx.{Major Len W. Cox - Advertising Manager} X1332 Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}14/KW.3.12.35. Tyre Noise - 20/25 HP. Cx.{Major Len W. Cox - Advertising Manager}5/KW.29.11.35. We will give you the latest information on this subject when you are here this week. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||