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 in-car temperatures and conditions under various ventilation settings.
| Identifier | ExFiles\Box 75\4\ scan0128 | |
| Date | 27th April 1915 guessed | |
| when excessively used. Tests with dashboard filled in, same car. Conditions as before. 1. Dashboard filled in, louvred side guards, ventilators closed, all windows closed. Floorboard temperature | Body temperature | Water temperature | Time under full power | Air temperature 41 | 29 | 70 | 8½ mins. | 18 49 | 28 | boil | | 18 No draught, no smell. Strong trailing wind. 2. Dashboard filled in, louvred side guards, dashboard ventilators closed, all side windows open. Floorboard temperature | Body temperature | Water temperature | Time under full power | Air temperature 34 | 25 | 70 | 9½ mins. | 18 41 | 31½ | boil | | 18 No smell, bad draught. 3. Dashboard filled in, louvred side guards, dashboard ventilators closed, front two side windows open only. Floorboard temperature | Body temperature | Water temperature | Time under full power | Air temperature 32 | 22 | 70 | 9½ mins. | 13 40 | 34½ | boil | | 13 No smell, no draught. H-T.Y. 230V (100 B) Y ANY AS(S)E(S) 68 2000 | ||