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 showing a sectional elevation and a head cutaway for a rotating port valve design.
| Identifier | ExFiles\Box 17\6\ Scan160 | |
| Date | 25th September 1933 guessed | |
| DIAGRAM 1. A.{Mr Adams} B. C. D.{John DeLooze - Company Secretary} SECTIONAL ELEVATION. DIAGRAM 2. INLET PORT. HEAD CUT ALONG THIS HORIZONTAL PLANE PLUG FITTED TO SEATING TO ACT AS LOCATING PIVOT WHEN ROTATING PORT | ||