Pencil sketch of an air cooler and associated piping for a Phantom III.
| Identifier | ExFiles\Box 131\4\ scan0143 | |
| Date | 9th April 1937 guessed | |
| air cooler hose welded on to existing pipe AZ series PHIII Rm {William Robotham - Chief Engineer} /ffH | ||
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).