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).
Test results comparing water and floorboard temperatures for different radiator and bonnet configurations.
| Identifier | ExFiles\Box 78\3\ scan0033 | |
| Date | 25th July 1909 | |
| R.R. 148. (20 H) (F.{Mr Friese} 23. 22.4.09) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 6930. with diff radiators & bonnets Floorboard & Water temperatures. John & C.P. (1011 chassis) 24 & 25/7/09. on the road max. loaded Flat tube radiator. Rise in ºC from floorboard Water Louvered bonnet. 66 23 Window type " closed 71 32 " " open 72 29 Zig Zag radiator (standard) Louvered bonnet 62 30 Window type bonnet closed 64 42 " " open 64 42 over | ||