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\ scan0124 | |
| Date | 7th December 1940 | |
| TORSIONAL DEFLECTION TEST ON 10" CLUTCH DISC. NEW CLUTCH DISC Nº 3. FRICTION 20 LB. FT. Test by Rigg 2B 25 C. G.B P. /7,12,40 TORQUE LB. FT. OVERDRIVE DRIVE DEFLECTION DEGREES. | ||