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).
Data table comparing atmospheric and water temperatures under different engine cooling configurations.
| Identifier | ExFiles\Box 75\3\ scan0187 | |
| Date | 23th November 1922 guessed | |
| SPEED 26 M.P.H. to 21 M.P.H. | | NO FAN. | 18" FAN. | 18" FAN. | | | COWLING OFF. ALL CLOSED | COWLING OFF. ALL CLOSED | COWLING ON. ALL CLOSED | | | ATMOS. | WATER | ATMOS. | WATER | ATMOS. | WATER | | START | 13°c | 60°c | 12½°c | 60°c | 14°c | 60°c | | MOVING HALF WAY | 13°c | 65½°c | 13°c | 64½°c | 13°c | 64½°c | | | | 71°c | | 69°c | | 69°c | | | | 76°c | | 74½°c | | 70½°c | | T | 12½°c | 79½°c | 13°c | 76°c | 13°c | 73°c | | ||