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).
Rating test graph for engine foot rubbers, plotting load versus deflection.
| Identifier | ExFiles\Box 104\1\ scan0039 | |
| Date | 15th January 1929 | |
| 15-1-29 ENGINE FOOT RUBBERS - 20 H.P. INDIA - F55840 MADE FROM F80057 - .150" DEFL AT 750LB. RATING TEST. LOAD - LB - 800 600 400 200 DEFLECTION - INS - .05 .10 .15 .20 | ||