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 log recording atmospheric and water temperatures during a run at 500 revs, with the fan belt turned on and off.
| Identifier | ExFiles\Box 75\4\ scan0003 | |
| Date | 26th January 1909 | |
| R.R. 148 (6 H) (A.{Mr Adams} 742. 30.11.08) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 6451. Test made by Lowe. 26/1/09. X819 | Atmospheric Temperature | Water Temperature | Time running at 500 revs | Notes | | :--- | :--- | :--- | :--- | | 43°F | 105°F | 15 minutes | Fan belt on | | 43°F | 150°F | " " | " " | | 43°F | 156°F | 15 minutes | | | 43°F | Fan belt off | | | | | 158°F | 1 minute | | | | 167°F | | | | | 176°F | 1 minute | | | | 184°F | | | | | 192.5°F | 1 minute | | | | 200°F | 1 minute | | | | 208°F | 1 minute | | | | 212°F | 1/2 minute | | | | Fan belt on | | | | | 212°F | | | | | 164°F | 30 minutes | | | ||