Plan drawing of an exhaust valve with annotations.
| Identifier | ExFiles\Box 11\3\ 03-page451 | |
| Date | 24th July 1931 guessed | |
| Plan of Exhaust Valve series of holes burnt into valve seating slightly exaggerated. Brass piece of square shank on valve 244 252 | ||
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).