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 comparing critical atmospheric temperatures for different radiator types under various driving conditions.
| Identifier | ExFiles\Box 15\1\ Scan416 | |
| Date | 21th October 1930 guessed | |
| TYPES OF RADIATOR. VERTICAL LOUVRES FULL THROTTLE. NO BONNET VENTILAT ALL OV 30 M.P.H. 40 M.P.H. 50 M.P.H. 6 ms. Parallel Sq. Tube. E.81385. 30.25 34.0°C. 42. 33 6/7¼ ms. Turbulent Flow Tubes. 26.0 31. 41. 32.25 6/7¼ Standard. 23. 27.25 36. 24.5 Figures given critical atmospheric temperature in °C. at which car will overheat if driven for sufficiently long under the conditions given. | ||