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).
Note regarding experimental cowling weights.
| Identifier | ExFiles\Box 98\1\ scan0071 | |
| Date | 27th June 1939 | |
| 400E. Rm.{William Robotham - Chief Engineer} Da{Bernard Day - Chassis Design}/EV.{Ivan Evernden - coachwork} 2/N. 27.6.39 Re experimental Cow weights. file 1115 | ||