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 showing the relative movement of the lever and cams for the Spectre front brakes with the drum in position.
| Identifier | ExFiles\Box 92\4\ scan0054 | |
| Date | 20th January 1935 | |
| 20TH JANUARY 1935 SPECTRECodename for Phantom III FRONT BRAKES. RELATIVE MOVEMENT OF LEVER & CAMS WITH DRUM IN POSITION. NOTICE:- THAT THE SPONGE AT MAXIMUM DEFLECTION REDUCES MOVEMENT TO 1/3 OF WHAT IT SHOULD BE. THAT THE TOTAL MOVEMENT OF SHOES IS VERY SMALL. Y-AXIS: MOVEMENT OF ACTUATING LEVER. THOUSANDTHS OF AN INCH. RADIUS = 4.3" X-AXIS: INCREASE OF DISTANCE BETWEEN SHOES AT A RADIUS OF 12.5 FROM PIVOT. THOUSANDTHS OF AN INCH. GRAPH LINES: LOAD INCREASING, LOAD DECREASING, NO SPONGE LINE READING TAKEN WITHOUT DRUM. | ||