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).
Graph from spring rating tests showing the effect of deflection due to shackle movement.
| Identifier | ExFiles\Box 43\2\ Scan166 | |
| Date | 27th May 1926 guessed | |
| (10) SPRING RATING TESTS. Y I Effect of Deflection due to Shackle movement SPRING RATING LBS / IN TOTAL SPRING LOAD. LBS Corrected Bump Loading Narrow Pad Shackle 10° Inward. | ||