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 top water temperature against miles run for experimental models 18 E.X. and 19 E.X.
| Identifier | ExFiles\Box 92\2\ scan0082 | |
| Date | 25th June 1930 guessed | |
| GRAPH VI. TOP WATER TEMP °C MILES RUN. 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. | ||