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 vehicle cabin temperature, smell, and draught under various ventilation configurations.
| Identifier | ExFiles\Box 75\4\ scan0126 | |
| Date | 22th February 1928 guessed | |
| 5. Dashboard not filled in, engine side guards louvred, dashboard ventilators closed, front windows open only. Side window closed. | Floorboards temperature | Body temperature | Water temperature | Time under full power | Air temperature | | :--- | :--- | :--- | :--- | :--- | | 43 | 15 | 70 | 10 mins. | 15 | | 55 | 15 | 90 | | 15 | No smell, bad draught. 6. Dashboard not filled in, engine side guards louvred, dashboard ventilators above floorboards open, front two side windows open only. | Floorboards temperature | Body temperature | Water temperature | Time under full power | Air temperature | | :--- | :--- | :--- | :--- | :--- | | 43 | 37 | 70 | 10 mins. | 15 | | 61 | 42 | 92 | | 15 | Bad smell, slight upward draught. 7. Dashboard not filled in, engine side guards louvred, ventilators above floorboards closed, front two side windows open, dashboard ventilators under floorboards taken right out, i.e. leaving holes 3 1/2" diameter. | Floorboards temperature | Body temperature | Water temperature | Time under full power | Air temperature | | :--- | :--- | :--- | :--- | :--- | | 42 | 35 | 70 | 10 mins. | 15 | | 58 | 40 | 92 | | 15 | Some smell, no draught. | ||