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 for a thermostat marked 'A', with temperature readings and radiator shutter operation points.
| Identifier | WestWitteringFiles\V\October1930-February1931\ Scan039 | |
| Date | 20th October 1930 | |
| Thermostat Test with Thermostat marked "A" Air Temp. 13° Half mile readings @ 30 MPH with starting temperature 62.5°. 62.5° 62.5° 63.5° 64° 65° 65° 65° 65° 65° Maximum temperature reached under ordinary driving conditions 69°. Radiator Shutters OPEN. @ 60.5° START TO CLOSE. 63°. FULLY CLOSED. 55°. Gordhyman 20-10-30. | ||