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).
Cross-section drawing of an FXI Cylinder Joint with dimensions.
| Identifier | ExFiles\Box 65\4\ scan0108 | |
| Date | 1st October 1928 guessed | |
| .050R .300 .4375 R 5.4245 5.200 DIA BOTTOM OF GROOVE F XI CYL JOINT | ||