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 dimensional specifications for a large circular component.
| Identifier | ExFiles\Box 170\1\ img010 | |
| Date | 14th January 1938 guessed | |
| 6.5 P.C.D 5.06 2.005 90' 14.41' DIA. (CIRCUMFERENCE 45.28') 15.985' 15.955' DIA (CIRCUMFERENCE 50.217' / 50.123') | ||