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).
Two graphs illustrating spring rating tests, one on the effect of internal friction and the other on the agreement of independent tests.
| Identifier | ExFiles\Box 67a\1\ scan0217 | |
| Date | 27th May 1925 guessed | |
| TOP GRAPH: (7) SPRING RATING TESTS (ε) AND (ε II) EFFECT OF INTERNAL FRICTION. RATING LBS / IN TOTAL SPRING LOAD. LBS WORKING RANGE GRADUAL BUMP NARROW PADS VERTICAL SHACKLE ε II ε BOTTOM GRAPH: (8) SPRING RATING TESTS. (α) AND (β) AGREEMENT OF INDEPENDENT TESTS. WIDE AXLE PADS RATING LBS / IN TOTAL LOAD. LBS α = 21° SHACKLE β = VERTICAL SHACKLE | ||