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 plotting the results of torsion tests on various front springs, showing angle of rotation against torque.
| Identifier | ExFiles\Box 42\3\ Scan203 | |
| Date | 10th August 1926 guessed | |
| TORSION TESTS ON FRONT SPRINGS ANGLE OF ROTATION TORQUE IN 1000 LBS - IN. Graph Labels: DA{Bernard Day - Chassis Design}, A4, B4, B3, A3, D3 LEGEND: A = FIRTH'S SPRING 1100 LBS TOTAL LENGTH 43.5 INS. B* = WOODHEADS EQUAL SPRING 1100 LBS TOTAL LENGTH 42.000 INS. D = SPECIAL " " 43.500 INS. THIS SPRING HAS FOUR REBOUND LEAVES & CLIPS Diagram showing spring leaves: = 4, = 3 * CONVERTED READINGS GIVING THE PRE-FRONT BRAKE SPRING THE SAME RATING AS THE POST FRONT BRAKE SPRING | ||