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).
The stiffness of an unwelded Bentley III frame at different material thicknesses.
| Identifier | ExFiles\Box 99\2\ scan0072 | |
| Date | 26th August 1938 guessed | |
| Bentley III frame. unwelded .128" thick. 1450 lbs. ft./degree .106" thick 1150 lbs. ft./degree | ||