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).
Blueprint of a Hardy coupling for a clutch, showing plan and cross-section views.
| Identifier | ExFiles\Box 137\4\ scan0368 | |
| Date | 18th September 1931 | |
| Hs{Lord Ernest Hives - Chair} 374 HARDY COUPLING FOR CLUTCH L.C. 2830 20° x 20° Rd 6.500 DIA 5.660 DIA CTS{C. Trot Salt - Carburation} 4.250 DIA 2.500 DIA 4 HOLES 1/8A FIT .050 .030 .010 .125 .810 .250 2.225 HARDY FABRIC HS{Lord Ernest Hives - Chair} 375 OTHER DIMENSIONS & SPLINES TO G 54334 SECTION ABC 4.450 DIA FRICTION PLATE G54340 ALTERED TO NEW SPLINES INSIDE DIA STAMP: ROLLS-ROYCE LIMITED, DERBY, 18 SEP 1931 | ||