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).
Comparative cost estimate for two change gear schemes.
| Identifier | ExFiles\Box 148\2\ scan0275 | |
| Date | 10th January 1940 | |
| γ 1260 To JRD/AML. from Rm.{William Robotham - Chief Engineer} Rm.{William Robotham - Chief Engineer}11/JH.10.1.40. Will you please let us have a comparative cost estimate of the 2 change gear schemes prints of which are attached herewith. Ev{Ivan Evernden - coachwork}'s. note is self explanatory. Rm.{William Robotham - Chief Engineer} | ||