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 showing load versus deflection for 20 HP India engine foot rubbers.
| Identifier | ExFiles\Box 104\1\ scan0043 | |
| Date | 15th January 1929 | |
| 15-1-29 ENGINE FOOT RUBBERS - 20 HP INDIA- F.55840 MADE FROM F.80057 - .150" DEFL: AT 750 LB. RATING TEST LOAD - LB 800 600 400 200 DEFLECTION - INS- .05 .10 .15 .20 | ||