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).
Temperature readings taken from a special zig-zag type radiator on a standing car.
| Identifier | ExFiles\Box 78\3\ scan0038 | |
| Date | 18th May 1909 | |
| R.R. 148 (20 H) (C. 898. 26.2.09) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 6740. Car standing 3500 taken on 975 chassis by machine Temperature readings taken with special zig zag type Radiator (40 mesh per in.sq) | Duration of run | Temp. under Floor boards | Temperature of Water in Radiator | Atmospheric temperature at end of Run. | |---|---|---|---| | - | 11°C | 11° | 14° | | 15 min | 47.5° | 72° | | | 30 " | 54° | 83° | | | 45 " | 56° | 86° | | | 1 hr | 57.5 | 87.5° | | | 1hr 15min | 58 | 88° | | | 1 " 30 " | 58 | 88.5° | | | 1 " 45 " | 58.5 | 88.5° | | | 2 hrs | 58 | 88.5° | | Speed of Engine 590 rpm Started cold | ||