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).
Two schematic diagrams for a manifold system, showing options with and without a central connection.
| Identifier | ExFiles\Box 66a\2\ scan0160 | |
| Date | 13th June 1927 guessed | |
| SCHEME 1 SCHEME 2 EACH SCHEME WITH & WITHOUT CENTRAL CONNECTION SHOWN DOTTED | ||