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 deflection versus load for 20 HP engine foot rubbers.
| Identifier | ExFiles\Box 104\1\ scan0078 | |
| Date | 18th February 1930 | |
| 20 HP ENGINE FOOT RUBBERS F80057 SUPPLIED BY DUNLOP'S (12 OFF Nº 1. TESTED) DRILLED 5/16 DIA TO MAKE F57075. DISTANCE PIECE 1.000" LONG TESTED IN CUPS F57078 18-2-30 DEFLECTION - INS LOAD ON TRAY - LB | ||