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).
Hand-drawn schematic showing four figures illustrating different component connections.
| Identifier | ExFiles\Box 65\2\ scan0187 | |
| Date | 30th January 1930 guessed | |
| 2 2R 2 2R 2 2R 2 2 2 2R 2 2R FIG. 1. FIG. 2. FIG. 3. FIG. 4. | ||