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).
Diagram showing a cross-section and external view of a mechanical valve component with handwritten annotations.
| Identifier | ExFiles\Box 77\1\ scan0070 | |
| Date | 27th September 1919 guessed | |
| L P T I B C T₁ F 1/8" PIPE THREADS HOLE FOR AIR VENT 31/32" 3" ABOUT 18 SWG WIRE 3/4" GL{G. Linnett} FOR FIRST 11700 CARS ONLY | ||