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 layout of components for the Rolls-Royce and Armstrong dampers.
| Identifier | ExFiles\Box 152\2\ scan0077 | |
| Date | 2nd November 1937 guessed | |
| 1, 2, 3, 4, 5, 6, ROLLS-ROYCE DAMPER, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, ARMSTRONG DAMPER, 17, 18, 19, 20, 21, 22 | ||