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 a torsional rating test on a Hardy Fabric gearbox coupling, showing angular movement versus torque.
| Identifier | ExFiles\Box 94\2\ scan0044 | |
| Date | 14th October 1936 | |
| GEAR BOX FABRIC COUPLING TEST TORSIONAL RATING TEST G80232 HARDY FABRIC ANGULAR MOVEMENT - DEGREES TORQUE LB FT LOADING RELEASING 1ST TEST { O TO 500LBFT TO O REPEAT { -300LBFT TO O.{Mr Oldham} HB{C. E. Harcombe} | ||