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 plotting top water, bottom water, and oil temperatures against miles run under specific test conditions.
| Identifier | ExFiles\Box 64\1\ scan0073 | |
| Date | 25th June 1931 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 m/m 7 1/2 m/m RAD. NO BONNET VENTILATION. ATS TEMP. 24°C | ||