Graph showing efficiency and hysteresis readings for a torsion shaft in a 20-25 front axle.
| Identifier | ExFiles\Box 84\2\ scan0246 | |
| Date | 21th December 1934 guessed | |
| PERCENTAGE EFFICIENCY 100% 90 80 MOVEMENT - THOUSANDTHS OF AN INCH 500 400 300 200 100 0 EFFICIENCY OF TORSION SHAFT IN 20-25 FRONT AXLE. HYSTERESIS READINGS TAKEN WITH SPRING BALANCE IN "SECONDARY" GIVING DEFINITE SLIP IN SHAFT. EFFICIENCY IS CONSTANT OVER MEASURABLE RANGE BEING EQUAL TO 88.7%. EFFICIENCY 88.7% LOAD-LBS 0 225 325 425 525 625 | ||
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).