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).
Authorising the modification of High Power Head No.2 following the completion of tests.
| Identifier | ExFiles\Box 133\1\ scan0165 | |
| Date | 20th February 1937 | |
| X 1129. E/PSN from Rm{William Robotham - Chief Engineer}/Ed{J. L. Edwards} Rm{William Robotham - Chief Engineer}/Ed{J. L. Edwards}5/M.20.2.37. High Power Head No.2. We have now completed all our tests on the above head in its present condition and as power relative to the standard unit is now back to normal, instructions may be issued for modifying the throat to LeC 5422. Rm{William Robotham - Chief Engineer}/Ed.{J. L. Edwards} | ||