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 deflection test on a 10 inch clutch disc.
| Identifier | ExFiles\Box 83\3\ scan0123 | |
| Date | 28th December 1940 | |
| TORSIONAL DEFLECTION TEST ON 10" CLUTCH DISC. TORQUE LB. FT. OVERDRIVE DRIVE NEW CLUTCH DISC Nº 2. FRICTION 28-35 LB. FT. DEFLECTION - DEGREES. Tested by Raughton Plot by G.B. Rm{William Robotham - Chief Engineer}/G.B. 28/12/40 | ||