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 comparing a standard radiator with a radiator fitted with copper tubes.
| Identifier | ExFiles\Box 38\2\ Scan169 | |
| Date | 13th January 1922 | |
| Mr. Hives from GWH.{George W. Hancock - Head Chateauroux} X3456 13.1.22. TESTS WITH STANDARD RADIATOR AND RADIATOR WITH COPPER TUBES. Standard. M.P.H. | Start | 1/2 mile | 1 mile | 1 1/2 mile | 2 miles | 2 1/2 miles | 3 miles 30 | 130°F | 132° | 132° | 130° | 130° | 130° | 130° 30 | 130°F | 130° | 130° | 130° | 130° | 130° | 131° Copper tubes. 30 | 130°F | 132° | 134° | 135° | 136° | 136° | 136° 30 | 130°F | 131° | 133° | 136° | 137° | 137° | 138° Test taken on London Rd. - temp. of atmosphere 5°C. Tests taken under same conditions. GWH.{George W. Hancock - Head Chateauroux} | ||