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).
Graph showing the spring rating of an Alfa-Romeo camshaft vibration damper.
| Identifier | ExFiles\Box 124\5\ scan0048 | |
| Date | 24th February 1938 | |
| ALFA-ROMEO CAMSHAFT VIBRATION DAMPER SPRING RATING. - TO .040" DEFLECTION. LOAD - LB 20 10 DEFLECTION FROM FREE POSITION - INS. .010 .020 .030 .040 24-2-38. | ||