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 coefficient of friction versus slipping speed for two Ferodo brake lining materials.
| Identifier | WestWitteringFiles\L\2Jan1924-March1924\ Scan35 | |
| Date | 1st February 1924 guessed | |
| FERODO LTD CHAPEL-EN-LE-FRITH DIAGRAM Nọ 35 NOTE WITHIN THE LIMITS OF NORMAL BRAKE PRESSURE, μ IS NOT AFFECTED BY DIFFERENCES IN PRESSURES. μ COEFFICIENT OF FRICTION STATIC FRICTION LINE SLIPPING SPEED - FEET PER MIN. FERODO FIBRE FERODO BONDED ASBESTOS 200 R.P.M OR 19½ M.P.H 400 Drum R.P.M or 39 M.P.H THE VALUE OF μ OBTAINED AT TEMPERATURES BETWEEN { 70° & 260°F FOR FERODO FIBRE 70° & 350°F FOR FERODO BONDED ASBESTOS } WITHIN + 5% AT THE HIGHER TEMPERATURE. THE GENERAL EFFECT OF TEMPERATURE IS TO INCREASE THE VALUE OF μ. | ||