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 actual stress curve of helical compression springs.
| Identifier | ExFiles\Box 154\1\ scan0274 | |
| Date | 7th April 1936 guessed | |
| ACTUAL STRESS CURVE OF HELICAL COMPRESSION SPRINGS. FACTOR 'Y' 2.3 2.2 2.1 2.0 1.9 1.8 1.7 1.6 1.5 1.4 1.3 1.2 1.1 1.0 RATIO: MEAN DIAMETER / WIRE DIAMETER 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | ||