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 showing the results of a torsional rating test on a Hardy fabric gearbox coupling.
| Identifier | ExFiles\Box 94\2\ scan0045 | |
| Date | 7th October 1936 | |
| GEAR BOX FABRIC COUPLING TORSIONAL RATING TEST G76576 HARDY FABRIC 7-10-36 LOADING RELEASING ANGULAR MOVEMENT - DEGREES TORQUE - LB. FT. 0 TO 500 LB FT TO 0 0 TO 500 LB FT TO -300 LB FT TO 0 | ||