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 showing results from spring rating tests focusing on the effect of internal friction.
| Identifier | WestWitteringFiles\O\2April1926-June1926\ Scan166 | |
| Date | 27th May 1926 guessed | |
| (8) SPRING RATING TESTS (13) AND (13 II). EFFECT OF INTERNAL FRICTION. WIDE PAD. VERTICAL SHACKLE. SPRING RATING LBS/IN. TOTAL SPRING LOAD. LBS B II = GRADUAL LOADING. B = BUMP LOADING. | ||