Two graphs showing spring rating tests, one for the effect of shackle angle and the other for the effect of pad width.
| Identifier | WestWitteringFiles\O\2April1926-June1926\ Scan164 | |
| Date | 27th May 1926 guessed | |
| TOP GRAPH: (2) SPRING RATING TESTS (S) AND (€) EFFECT OF SHACKLE ANGLE NARROW PADS WORKING RANGE S = 21° FORWARD SHACKLE € = VERTICAL SHACKLE Y-AXIS: RATING LBS/IN. X-AXIS: TOTAL SPRING LOAD. LBS BOTTOM GRAPH: (3) SPRING RATING TESTS (B) AND (€) EFFECT OF PAD WIDTH. VERTICAL SHACKLE WORKING RANGE 1100 LBS B = WIDE PAD. € = NARROW PAD. Y-AXIS: RATING LBS/IN. X-AXIS: TOTAL SPRING LOAD. LBS | ||
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).