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 temperatures of models 19 E.X. and 18 E.X. during a test run.
| Identifier | ExFiles\Box 14\7\ Scan024 | |
| Date | 2nd July 1930 guessed | |
| GRAPH VI. TOP WATER TEMP °C MILES RUN. OPENED UP TO FULL THROTTLE. 18 E.X. 19 E.X. COMPARISON OF 19 E.X. AND 18 E.X. 6m/m 7 1/2m/m RAD. 62 M.P.H. TOP WATER TEMP. No BONNET VENTILATION. ATB TEMP 24°C. | ||