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 Ferodo and Halo brake linings, showing the effects of temperature.
| Identifier | WestWitteringFiles\K\December1923\ Scan57 | |
| Date | 8th December 1923 guessed | |
| COMPARISON OF FERODO & HALO BRAKE LININGS SHOWING EFFECTS OF TEMPERATURE. Halo --- Ferodo - - - LOAD 20Lbs. R.P.M OF BRAKE DRUM MINS | ||