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).
Chart of brake drum temperatures against miles driven for a 4¼ Litre Bentley during a 'Royal Red Gate Run'.
| Identifier | ExFiles\Box 85\1\ scan0089 | |
| Date | 5th May 1936 guessed | |
| BRAKE DRUM TEMPERATURES CHART - ROYAL RED GATE RUN 4¼ LITRE BENTLEY 3 B IV DRUMS USED:- O.S.F. ALUMINIUM RM{William Robotham - Chief Engineer}/55 2 B 12 (BRIMOL) N.S.F. " IM30 (MILLENITE) O.S.R. " HS{Lord Ernest Hives - Chair}/2205 5 M26 ( " ) N.S.R. " 4.9 C.S. 26 (CARBON STEEL) TIME - MINUTES & SECONDS. 0 1-25 8-30 13-32 18-3 22-24 26-23 30-58 33-15 34-30 DEGREES CENTIGRADE. MILES. THE 2 LINES SHOW MAXIMUM VARIATION BETWEEN INDIVIDUAL DRUMS. | ||