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 engineering diagram of a cylinder head with dimensions and a cross-section view.
| Identifier | ExFiles\Box 126\2\ scan0132 | |
| Date | 18th November 1938 guessed | |
| CYLINDER HEAD SECTION XX plugs A X 1 3/4" 1/2" 2 1/2" 6 1/2" 2 7/8" 5" SS{S. Smith}199 | ||