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).
Blueprint detailing the specifications of a Hispano front brake drum.
| Identifier | WestWitteringFiles\W\September1931-November1931\ Scan064 | |
| Date | 2nd November 1931 guessed | |
| HISPANO FRONT BRAKE DRUM. MATERIAL - ALUMINIUM WITH STEEL LINER. .800 .180 .320 .210 .300 2.500 8 M/M DIA. STEEL LINER. 15.750 DIA. 10 M/M STUDS 4.925 DIA. WEIGHT = 16 LBS. 9 OZS. | ||