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).
Data table of load versus deflection measurements in inches during loading and unloading cycles.
| Identifier | ExFiles\Box 132\3\ scan0212 | |
| Date | 9th February 1931 guessed | |
| LOAD LB 50 100 150 200 DEFLECTION-INS LOADING - .700 1.480 2.100 UNLOADING .950 1.300 1.850 2.100 | ||