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).
Visibility of dynamo louvres from the position a sketch was made.
| Identifier | ExFiles\Box 97\2\ scan0076 | |
| Date | 23th May 1939 | |
| Hoo? W/S. Bkl. from Rm.{William Robotham - Chief Engineer} Bkl.11/22.5.39. Rm{William Robotham - Chief Engineer}5/R.23.5.39. The dynamo has louvres on it, but they are more or less underneath, possibly, therefore, they would not be visible from the position from which Mr. Clarke sketched it. Rm.{William Robotham - Chief Engineer} | ||