Two graphs illustrating spring rating tests, one for the effect of pad width and another comparing different spring systems.
| Identifier | WestWitteringFiles\O\2April1926-June1926\ Scan165 | |
| Date | 27th May 1926 guessed | |
| TOP GRAPH: (4) SPRING RATING TESTS. (δ) AND (α) EFFECT OF PAD WIDTH. 21° SHACKLE RATING LBS/IN. TOTAL LOAD. LBS. α = WIDE PAD. δ = NARROW PAD. WORKING RANGE 1100 LBS. Y-Axis Scale: 250, 300, 350, 400, 450, 500 X-Axis Scale: 0, 300, 600, 900, 1200, 1500, 1800 BOTTOM GRAPH: (6) SPRING RATING TESTS. (α) AND (ϵ) COMPARISON OF SPRING SYSTEMS. RATING LBS/IN. TOTAL SPRING LOAD. LBS. α = WIDE PAD. 21° SHACKLE. ϵ = NARROW PAD. VERTICAL SHACKLE. WORKING RANGE 1100 LBS. Y-Axis Scale: 250, 300, 350, 400, 450, 500 X-Axis Scale: 0, 300, 600, 900, 1200, 1500, 1800 | ||
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).