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).
Graph comparing the top water temperature against miles run for two different engine and radiator configurations.
| Identifier | ExFiles\Box 29\3\ Scan214 | |
| Date | 2nd July 1938 guessed | |
| GRAPH VI TOP WATER TEMP °C MILES RUN 100 90 80 70 60 2.5 5 7.5 10 12.5 15 17.5 20 22.5 18 E.X. 19 E.X. OPENED UP TO FULL THROTTLE. COMPARISON OF 19 E.X. AND 18 E.X. 6 m/m 7 1/2 m/m RAD. 62 M.P.H. TOP WATER TEMP No BONNET VENTILATION ATS TEMP 24°C. | ||