Graph IV showing Oil and Top Water temperatures versus miles run under varying car conditions.
| Identifier | ExFiles\Box 15\1\ Scan292 | |
| Date | 2nd July 1938 guessed | |
| GRAPH IV TEMP C° MILES RUN 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 VENTILATED UNDERSHIELD ALL BONNET SHUTTERS OPEN | ||
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).