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 rating tests on engine foot rubbers, part number F.57075.
| Identifier | ExFiles\Box 104\1\ scan0091 | |
| Date | 17th October 1930 | |
| ENGINE FOOT RUBBERS. - 20 HP - F.57075 RATING TESTS. DEFLECTION - INS. LOAD - LB. .050 .100 .150 .200 100 200 300 400 500 600 700 PROCESS 1497 FREE LENGTH. 1·250" PROCESS 1496 " " 1·100" 18 G.V. FOR 10000 MILES TEST 17.10.30 | ||