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).
Table recording water temperature, under bonnet air temperature, and atmospheric temperature over time.
| Identifier | ExFiles\Box 102\6\ scan0143 | |
| Date | 11th October 1932 guessed | |
| (2) Time. | Water Temp oC. | Air Temp. oC Under bonnet. | Atmos. Temp oC 19 min | 70 | 39 | 11 20 " | 69 | 39 | 11 21 " | 68 | 39 | 11 | ||