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 oil and water temperatures against miles run under specific speed and ventilation test conditions.
| Identifier | WestWitteringFiles\U\May1930-July1930\ Scan106 | |
| Date | 26th June 1930 guessed | |
| GRAPH IV 62 M.P.H. C.O. CLOSED CAR OPENED FULL OUT C O OPEN 83 M.P.H. Ats TEMP 20°C OIL TEMP TOP WATER TEMP C° 100° 90° 80° 70° VENTILATED UNDERSHIELD ALL BONNET SHUTTERS OPEN MILES RUN 25 30 35 | ||