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).
Data log of a torsion test on a spring, recording torque versus torsion angle.
| Identifier | ExFiles\Box 54\3\ Scan104 | |
| Date | 17th March 1923 guessed | |
| X2628 Weight of Lever = 10 lbs. Weight of Tray = 66 1/4 lbs. Load applied at 1 ft. from centre of Spring. Torque. Torsion Torque Torsion ft. lbs. Degrees & mins. ft. lbs. Degrees & mins. 0 0° 436.5 100° 45 mins. 66.5 10° 30 mins. 446.5 100° 55 " 76.5 20° 456.5 110° 10 " 86.5 20° 5 mins. 466.5 110° 20 " 96.5 20° 10 " 476.5 110° 35 " 106.5 20° 20 " 486.5 110° 50 " 116.5 20° 30 " 496.5 110° 55 " 126.5 20° 35 " 506.5 120° 5 " 136.5 20° 45 " 516.5 120° 15 " 146.5 30° 526.5 120° 25 " 156.5 30° 15 " 536.5 120° 35 " 166.5 30° 40 " 546.5 120° 45 " 176.5 30° 55 " 556.5 130° 186.5 40° 10 " 566.5 130° 10 " 196.5 40° 30 " 576.5 130° 25 " 206.5 40° 50 " 586.5 130° 35 " 216.5 50° 10 " 596.5 130° 40 " 226.5 50° 30 " 606.5 130° 55 " 236.5 50° 50 " 616.5 140° 10 " 246.5 60° 10 " 256.5 60° 30 " 266.5 70° 276.5 70° 20 " 286.5 70° 35 " 296.5 70° 50 " 306.5 80° 316.5 80° 15 " 326.5 80° 30 " 336.5 80° 50 " 346.5 90° 5 " 356.5 90° 20 " 366.5 90° 30 " 376.5 90° 45 " 386.5 90° 55 " 396.5 100° 5 " 406.5 100° 15 " 416.5 100° 25 " 426.5 100° 35 " | ||