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 F.78114 Engine Foot Rubbers, plotting load in pounds against deflection in inches.
| Identifier | ExFiles\Box 65\4\ scan0129 | |
| Date | 2nd January 1929 | |
| RATING TEST. F.78114 Engine Foot Rubbers. Supplied by Messrs. Dunlop 2.1.29. LOAD LBS. 1000 800 600 400 200 DEFLECTION INS. .05 .10 .15 .20 | ||