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 showing water and oil temperatures plotted against miles run during a vehicle test.
| Identifier | ExFiles\Box 24\5\ Scan239 | |
| Date | 2nd July 1938 guessed | |
| GRAPH I TEMP C° 90° 80° 70° 60° MILES RUN TOP WATER OIL BOTTOM WATER 19 E.X. 14 x 52 AXLE. 62 M.P.H. 6 7/m 7 1/2 /m RAD. NO BONNET VENTILATION. Ats TEMP 24°C | ||