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 of two engine models, 19 EX and 18 EX, over a test run.
| Identifier | ExFiles\Box 24\5\ Scan245 | |
| Date | 2nd July 1938 guessed | |
| GRAPH VI. TOP WATER TEMP C° 100 90 80 70 60 MILES RUN. 2.5 5 7.5 10 12.5 15 17.5 20 22.5 OPENED UP TO FULL THROTTLE. 18 EX. 19 EX. COMPARISON OF 19 E.X. AND 18 E.X. 6 7/8 m/m 7 1/2 m/m RAD. 62 M.P.H. TOP WATER TEMP. No BONNET VENTILATION. ATS TEMP 24°C. | ||