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).
Modifying pivot drawings to increase section strength following a failure.
| Identifier | ExFiles\Box 82\3\ scan0253 | |
| Date | 10th May 1935 guessed | |
| RM{William Robotham - Chief Engineer} We have had Drgs of 4º Pivots modified to increase section where we understand failure has occurred & have arranged to produce some strengthened pieces. NAC | ||