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 report comparing water and floor board temperatures for different types of bonnets.
| Identifier | ExFiles\Box 119\3\ scan0059 | |
| Date | 2nd July 1914 | |
| Type of Bonnet. Atmos. temp. Type of Radiator. Start. 1 2 3 4 5 6 7 8 9 10. Water Temperatures. Plain 19°C 20" standard 70° 76° 77° 77° 79° 88° 72° 71° 74° 74° 75°. Two shutters 19°C 20" 70° 74° 75° 74° 75° 84° 68° 67° 70° 72° 73°. Four shutters, 19°C 20" 70° 74° 74° 72° 73° 81° 65° 64° 67° 69° 70°. Louvred 19.5°C 20" 70° 74° 73° 70° 71° 79° 66° 62° 66° 68° 70°. Floor board temperatures - covered body. Plain 19.5° 20" 40° 40° 40° 41° 41° 42° 41° 41° 41° 40° 40°. Two shutters 19.5° 20" 40° 39° 40° 40° 41° 41° 41° 40° 40° 40° 39°. Four shutters 19.5° 20" 41° 40° 40° 39° 39° 40° 41° 40° 39° 39° 39°. Louvred bonnet 19.5° 20" 40° 39° 39° 38° 38° 39° 39° 39° 39° 37° 38°. N.R. 238X (L.S.D. II) (W.W. - 821) 2-7-14 (G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 6870) | ||