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).
Drawing of a front brake drum made from aluminium with a steel liner, showing dimensions and weight.
| Identifier | ExFiles\Box 73\2\ scan0241 | |
| Date | 1st February 1924 guessed | |
| FRONT BRAKE DRUM MATERIAL. ALUMINIUM. WITH STEEL LINER .320 .480 2.50 .30 10 1/8 HOLES 4.925 DIAM 15.75 DIAM STEEL LINER WEIGHT = 16 lbs 9 oz | ||