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).
Specifications for a 5' deflection spring with a variable rating.
| Identifier | ExFiles\Box 95\3\ scan0069 | |
| Date | 28th February 1935 | |
| -2- Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}16/KW.28.2.35. Hs.{Lord Ernest Hives - Chair}1802. 5" Deflection Springs for Variable Rating N.Sch.4177. Wire Size .87 Mean radius 1.900 Working coils 4.75 Free length 7.950 Load when compressed to 6.600 4450 lbs. Rate 3300 lbs/in. Stress max. bump 115,000 lbs/sq.in. Other particulars to G.82346. | ||