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 for an 18-inch fan with shutters closed during a throttling down test on Swinscoe Hill.
| Identifier | ExFiles\Box 77\4\ scan0287 | |
| Date | 31th October 1922 | |
| X4240 31.10.22 18" Fan - all shutters closed - throttling down. Tests on Swinscoe Hill. Speedometer reading. 3rd. Gear. 2.nd. Gear. 1st. Gear. Atmos: Water. Atmos: Water. Atmos: Water. Start. 7°C 60°C 6°C 60°C 5½°C 60°C 63 " 63 " 61 " 65 " 64 " 62 " 67 " 65 " 63 " Finish. 6°C 66 " 5°C 64½" 4½°C 62 " | ||