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).
Blueprint showing a cross-section on Web 'A' with dimensional callouts.
| Identifier | ExFiles\Box 179\3\ img113 | |
| Date | 31th January 1932 guessed | |
| SECTION ON WEB 'A' 2.625" 2.750" RAD. | ||