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 from a stationary car test using a standard zig-zag type radiator.
| Identifier | ExFiles\Box 78\3\ scan0035 | |
| Date | 18th May 1909 | |
| R.R. 148 (20 H) (C. 898. 26.2.09) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 6740. Car standing No 975 Chass. Temperature readings taken with Standard Zig Zag Type Radiator (50 mesh per width) X496 loker 18/5/09 by Machine 3500 Duration of Run - 15 min 30 " 45 " 1 hr. 1 " 15 min 1 " 30 " Temp: under Hood Boards 23°C 52 57 58 59 59.5 59.5 Temp: of water in Radiator 36° 72° 77° 77° 77.5° 77.5° 77.5° Atmospheric temperature at end of Run. 14°C. Speed of Engine 590 r.p.m. Engine was slightly warm when this test was started, as first reading shows. | ||