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).
Blueprint showing two graphs for spring rating tests, comparing pad widths and spring systems.
| Identifier | ExFiles\Box 67a\1\ scan0216 | |
| Date | 27th May 1925 guessed | |
| (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. (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. | ||