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).
Specification sheet for a damping spring, detailing its dimensions and properties.
| Identifier | ExFiles\Box 103\3\ scan0122 | |
| Date | 27th October 1931 guessed | |
| Hs{Lord Ernest Hives - Chair} 452 DIA OF WIRE .056 - 17 S.W.G. OUTSIDE DIA OF HELIX .380 NO: OF WORKING COILS 4 WITH ONE COIL GROUND SQUARE EACH END) MAKING A TOTAL OF 6 COILS FREE LENGTH .731 (APPROX) LOAD WHEN COMPRESSED TO .575 TO BE 17 lbs +/- 1 lb 10 OFF STRESS 80500 lbs/□" DAMPING SPRING [ES5105] | ||