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 SPECTRE(Codename 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. | ||
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).