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).
Fatigue limit diagram for special tempered steel number 11.
| Identifier | ExFiles\Box 158\4\ scan0074 | |
| Date | 10th October 1936 guessed | |
| FINAL STRESS, THOUSAND LBS. PER SQ. INCH. INITIAL STRESS, THOUSAND LBS. PER SQ. INCH. Figure 11. Fatigue Limit Diagram for Special Tempered Steel #11. All stresses calculated by Wahl formula. ENDURANCE LIMIT ELASTIC LIMIT NO. 1, 4, BROKEN NO. 2, 3, UNBROKEN | ||