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 a 24 EX thermostat, including temperature readings and radiator shutter operation points.
| Identifier | WestWitteringFiles\V\October1930-February1931\ Scan038 | |
| Date | 20th October 1930 | |
| Thermostat Test with 24 EX Thermostat Air Temp. 11.5° Half mile reading at 30 MPH with starting temp 64.5°. 67.5° 67.5° 68° 69° 69.5° 69.5° 69.5° B Maximum temp reached under ordinary driving conditions 72.5°. Radiator Shutters. OPEN @ 73° START TO CLOSE 75° FULLY CLOSED. 67° Goodyman 20-10-30 | ||