Blueprint containing two graphs showing practical braking figures obtained with a three-pen chronograph.
| Identifier | ExFiles\Box 178\1\ img077 | |
| Date | 12th October 1925 guessed | |
| PRACTICAL BRAKING FIGURES OBTAINED WITH THREE PEN CHRONOGRAPH. Graph A: Y-Axis: ROAD SPEED M.P.H. X-Axis: DISTANCE TO REST. FEET. Boxed Text: OPEN TOURING CAR BRAKING. DISTANCE TO REST. 40% BRAKING ON FRONT. REAR WHEELS ON POINT OF LOCKING. SURFACE DRY MACADAM. RETARDATIONS CALCULATED FROM GRAPH 'A'. Graph B: B. Y-Axis: RETARDATION FT/SEC² X-Axis: ROAD SPEED M.P.H. Boxed Text: RETARDATIONS OBTAINED AT VARIOUS ROAD SPEEDS. MAX. VARIATION EXPERIENCED DURING TESTS INDICATED. FULL LINE REPRESENTS MEAN RETARDATION. SURFACE DRY MACADAM. | ||
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).