Pencil sketch of a Phantom III float chamber showing modifications to the vent position and an isolated chamber.
| Identifier | ExFiles\Box 91\1\ scan0323 | |
| Date | 14th June 1936 guessed | |
| PHANTOM III FLOAT CHAMBER 67-1 POSITION OF OLD VENT. POSITION OF NEW VENT PARTITION ISOLATED CHAMBER WHERE PETROL BOILS. HH: | ||
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).