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 Zimmerman radiator on a standard chassis, showing temperature readings under specific running conditions.
| Identifier | ExFiles\Box 78\3\ scan0021 | |
| Date | 10th June 1912 guessed | |
| 11 XU96 Zimmerman radiator on standard chassis with louvred side strips and dashboard filled in. Average read with slight trailing wind. 1. With ordinary running 15 miles, speed of 25 to 35 miles per hour. one minute readings. Atmos temp. Water temp Floorbd's. temp underneath. Floorbd's. temp on top. Start 68 60 25.5 20.5 68 69 28. 22 68 71 29. 22. 68 72 32 23 68 75 35. 25. 68 75 35. 24. Cont'd | ||