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).
Summary of temperature tests conducted on four different types of radiators.
| Identifier | ExFiles\Box 78\3\ scan0036 | |
| Date | 16th October 1908 guessed | |
| Summary of Temperature tests with various types radiators X496 '3500 Ordinary 1907 type radiator Car standing. Engine running Rise in water temp. 73°C. Floorboards 63°C. On the road. car running -- 50°C. rise Special round tube radiator Rise in water temp. 77°C Floorboards 46°C } Car standing New type flat tube radiator. Car standing Rise in water temp. 62°C Floorboard 39°C. " " 62°C Running on road} full power 32°C. New zig-zag radiator. Car standing Rise in water temp. 60°C Rise in floorboard 35°C " " 60°C Running on road " 27°C see further card. | ||