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 experimental engine configurations (18 E.X. and 19 E.X.) over distance.
| Identifier | ExFiles\Box 19\4\ Scan085 | |
| Date | 2nd July 1930 guessed | |
| GRAPH VI. TOP WATER TEMP °C MILES RUN. 18 EX. 19 EX. OPENED UP TO FULL THROTTLE COMPARISON OF 19 E.X. AND 18 E.X. 6 7/m 7 1/2"/m RAD. 62 M.P.H. TOP WATER TEMP. No BONNET VENTILATION. ATS TEMP 24°C. | ||