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 the temperature (°C) of top water, oil, and bottom water against miles run.
| Identifier | ExFiles\Box 19\4\ Scan079 | |
| Date | 2nd July 1930 guessed | |
| GRAPH I TEMP C° MILES RUN TOP WATER OIL BOTTOM WATER 19 E.X. 14 x 52 AXLE 62 M.P.H. 6m/m 7 1/2 % RAD. No BONNET VENTILATION. Ats TEMP. 24°C | ||