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).
Stress-strain diagram for pretempered wire steel, showing both tension and torsion curves.
| Identifier | ExFiles\Box 158\4\ scan0071 | |
| Date | 10th October 1936 guessed | |
| TENSION CURVE INCHES ELONGATION STRESS, THOUSAND LBS. PER SQ. INCH. INCHES ELONG. DEGREES TORQUE TORSION CURVE. Figure 8. Stress-Strain Diagram for Pretempered Wire Steel #4. Ultimate strength 216,000 P.S.I. Tension Ultimate strength 180,000 P.S.I. Torsion Elastic Limit 180,000 P.S.I. Tension Elastic Limit 115,000 P.S.I. Torsion Elongation 8"—5.4%, 2"—8.8% Reduction of Area 52%. | ||