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 | ||
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).