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).
Hand-drawn diagram illustrating the operational range and settings of a valve.
| Identifier | ExFiles\Box 156\1\ scan0005 | |
| Date | 13th May 1929 guessed | |
| at and past arrow, valve did not open at all. Stop Decrease 96 81 76 71 65 59 55 47 42 as far as arrow valve is open at normal atmospheric temperature. Stop | ||