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 comparing the Société Continentale formula and Dunlop figures for tyre rolling resistance at various speeds and inflation pressures.
| Identifier | ExFiles\Box 158\1\ scan0225 | |
| Date | 19th November 1938 guessed | |
| COMPARISON OF "SOCIÉTÉ CONTINENTALE" FORMULA AND DUNLOP FIGURES ROLLING RESISTANCE Y-AXIS: ROLLING RESISTANCE, LBS/TON. X-AXIS: SPEED M.P.H. Graph Labels & Legends: 40 LBS/IN² 36 LBS/IN² 35 LBS/IN² 30 LBS/IN² 25 LBS/IN² TYRE SIZES 6.50-17.00 AND 7.00-18.00 ARE USED TO OBTAIN DUNLOP FIGURES ⊕ DUNLOP FIGURES. EACH POINT REPRESENTS THE MEAN OF THE NUMBER OF READINGS SHOWN BY THE ADJACENT FIGURE. ---- SOCIÉTÉ CONTINENTALE FORMULA FOR INFLATION PRESSURE SHOWN. Data point figures: 1, 3, 4, 5. | ||