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).
Blueprint diagram showing pressure and return lines.
| Identifier | ExFiles\Box 12\1\ 01-page097 | |
| Date | 13th November 1928 guessed | |
| F77336 PRESSURE RETURN | ||