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).
Line graph chart displaying top water, bottom water, oil, and air temperatures for a 250-mile average day's run.
| Identifier | WestWitteringFiles\V\2January1931-April1931\ Scan024 | |
| Date | 9th December 1930 | |
| TOP WATER TEMP. 18G. IV. °C 74 72 70 68 66 64 62 60 58 56 54 52 48 BOTTOM WATER TEMP. OIL TEMP. 60° 58 56 54 52 50 48° 46° 44° 42° 40° AIR TEMP. 10°C 8° 6° 4° 2° 0° 250 MILES. AVERAGE DAYS RUN. 9 . 12 . 30. | ||