Photograph of a circular mechanical component with various levers and fittings, and its disassembled parts.
| Identifier | ExFiles\Box 128\2\ scan0007 | |
| Date | 14th November 1930 guessed | |
| ROLLS-ROYCE LTD. PHOTO. DEPT. DERBY. 105 | ||
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).