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).
Test results from a 12-mile run measuring air, oil, and water temperatures at various speeds, with and without front timing case lagging.
| Identifier | ExFiles\Box 82\1\ scan0079 | |
| Date | 5th April 1933 | |
| To Hs.{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} x4r53a 5.4.33. - 2 - RUN OF 12 MILES EACH TEST. Front timing case lagged, radiator shutters held open. M.P.H. AIR OIL WATER 60 14°C 72°C 50°C 70 14°C 78°C 52°C 80 14.5°C 86°C 56°C Lagging removed M.P.H. AIR OIL WATER 60 15°C 72°C 50°C 70 15°C 75°C 52°C 80 15°C 81°C 56°C [Signature] G.W.H. | ||