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 cross-section diagram of a cylinder head with dimensions.
| Identifier | ExFiles\Box 126\2\ scan0133 | |
| Date | 18th November 1938 guessed | |
| CYLINDER HEAD, 3/4" HIGH, 5/16" HIGH, 3/8" WEBS, 3, 4, 5, W, SECTION AA{D. Abbot-Anderson}, 552.00 | ||