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).
Drawing showing the dimensions of an exhaust valve and an inlet valve.
| Identifier | ExFiles\Box 126\2\ scan0141 | |
| Date | 18th November 1938 guessed | |
| VALVES, SS{S. Smith} 211, 9/32", 5/16", 5 1/4", 1/8", 45°, 1 3/8" DIA, ExH. VALVE, 1 5/8" DIA, INLET VALVE | ||