Diagram showing the mechanism of a Phantom II Twin Choke Carburettor.
| Identifier | ExFiles\Box 122\1\ scan0101 | |
| Date | 15th May 1931 guessed | |
| P.II TWIN CHOKE CARB. No.1. ADJ SCREW Club Foot. No.2. ADJ SCREW. ael | ||
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).