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).
Coolant jets for the exhaust valve seats on the Wraith III and Bentley III models.
| Identifier | ExFiles\Box 10\3\ 03-page203 | |
| Date | 26th April 1939 | |
| 654 Rm.{William Robotham - Chief Engineer} Da.{Bernard Day - Chassis Design} 13/G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 26.4.39 Wraith III + Bentley III Coolant Jets for Exhaust Valve Seats. file 1360. | ||