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).
Log of temperature readings from a 25EX thermostat test.
| Identifier | WestWitteringFiles\V\October1930-February1931\ Scan037 | |
| Date | 20th October 1930 | |
| Thermostat Test. 25EX Thermostat Air Temp. 12° Half mile readings @ 30 MPH with starting temperature 63°. 63° 63.5° 63.5° 64.5° 65° 65° 65° As above with starting temp. 68.5° 68.5° 67.5° 66.5° 66.5° 66° 66.5° 66.5° 66° 65.5° 65° 65° 65° 64.5° 64.5° Car thermometer reads 66.5° when glass thermometer in top of Radiator reads 69°. Gawshyman 20-10-30 | ||